#of course this is not an extensive analysis and there are more facettes to his character

[mrsjadecurtiss]

What do you think of Robert? What are your opinions on him, do you think that if the war never happened that he'd still go down this self destructive path?

I think Robert was fundamentally not made to be a king - He has the charisma and the looks and is an able warrior, but his negative character traits are indulged and enhanced by his position and led him down an almost unavoidable path.

Robert is someone who above all wants to enjoy and live an easy life:

"You need to come south," Robert told him. "You need a taste of summer before it flees. [...] Flowers everywhere, the markets bursting with food, the summerwines so cheap and so good that you can get drunk just breathing the air. Everyone is fat and drunk and rich." He laughed and slapped his own ample stomach a thump. "And the girls, Ned!" he exclaimed, his eyes sparkling. "I swear, women lose all modesty in the heat.[...]" The king laughed happily. Robert Baratheon had always been a man of huge appetites, a man who knew how to take his pleasures. - Eddard I, aGoT

"Robert wanted smiles and cheers, always, so he went where he found them, to his friends and his whores. Robert wanted to be loved." - Sansa IV, aCoK

He has just enough of a moral understanding to at least know when he is doing wrong and to even feel bad about it at times, but not enough to actually change anything about himself.

The rage was gone from him now; in his eyes Ned saw something sad and scared. "I should not have hit [Cersei]. That was not … that was not kingly." He stared down at his hands, as if he did not quite know what they were. - Eddard X, aGoT

Robert desires to have an easy life, he wants to be loved, he wants to have fun, but he does not want to deal with the hard and unpleasant things. In times of crisis, he wants to take the easy way out, and he prefers to avoid uncomfortable truths.

Lord Tywin stared at him as if he had lost his wits. "[...] When I laid those bodies before the throne, no man could doubt that we had forsaken House Targaryen forever. And Robert's relief was palpable. As stupid as he was, even he knew that Rhaegar's children had to die if his throne was ever to be secure. Yet he saw himself as a hero, and heroes do not kill children." - Tyrion VI, aSoS

"Well, now I know Jaime's dark sin, and the matter can be forgotten. I am heartily sick of secrets and squabbles and matters of state, Ned." - Eddard II, aGoT

"Most likely the king did not know," Littlefinger said. "It would not be the first time. Our good Robert is practiced at closing his eyes to things he would rather not see." - Eddard IV, aGoT

He feels most comfortable when he is surrounded by people who love him and know how to handle him/want the best for him, and steer him onto the right path in a way where he can still feel good about himself.

"These are difficult times. I need good men about me. Men like Jon Arryn. He served as Lord of the Eyrie, as Warden of the East, as the Hand of the King. He will not be easy to replace." - Eddard I, aGoT

In an environment that works against him, or goes against his wishes even if it is for the better, it creates a destructive energy in him. He cannot stand dissent to his wishes because it robs him of a pleasure he desires, and creates unwanted conflict. He also cannot handle constructive criticism because it makes him confront unpleasant truths - he always wants the easiest path with the least tension. If he is presented with a situation that strains his limits as there is no amiable solution to a difficult/disturbing problem, his reaction is a toxic one; turning to rage and violence even towards his own child.

Not for the first time, he wondered what he was doing here and why he had come. He was no Jon Arryn, to curb the wildness of his king and teach him wisdom. Robert would do what he pleased, as he always had, and nothing Ned could say or do would change that. - Eddard II, aGoT

He may act against what he knows is right, because it is the easiest route; like when he has the wolf Lady killed to please Cersei:

“A costly pelt,” Robert grumbled. “I want no part of this, woman. You can damn well buy your furs with Lannister gold.” [...] "We have a wolf," Cersei Lannister said. Her voice was very quiet, but her green eyes shone with triumph. It took them all a moment to comprehend her words, but when they did, the king shrugged irritably. "As you will. Have Ser Ilyn see to it." - “Robert, you cannot mean this,” Ned protested. The king was in no mood for more argument. “Enough, Ned, I will hear no more." - Eddard III, aGoT

"I am sorry for your girl, Ned. Truly. About the wolf, I mean. My son was lying, I'd stake my soul on it." - Eddard VII, aGoT

And when Ned reprimands him about Daenerys he will not hear dissent, even though he knows deep down that it is wrong:

He gave the king a long cool look. “Would [the man who spared Barristan] were here today.” Robert had shame enough to blush. “It was not the same,” he complained. “Ser Barristan was a knight of the Kingsguard.” - “Whereas Daenerys is a fourteen-year-old girl.”

[...] “Not another word. Have you forgotten who is king here?” - “No, Your Grace,” Ned replied. “Have you?” - “Enough!” the king bellowed. “I am sick of talk. I’ll be done with this, or be damned."

[...] “I will not be part of murder, Robert. Do as you will, but do not ask me to fix my seal to  it.” For a moment Robert did not seem to understand what Ned was saying. Defiance was not a dish he tasted often. Slowly his face changed as comprehension came. [...] “You are the King’s Hand, Lord Stark. You will do as I command you, or I’ll find me a Hand who will.” - “I wish him every success.” Ned [...] laid [his badge of office] on the table in front of the king, saddened by the memory of the man who had pinned it on him, the friend he had loved. “I thought you a better man than this, Robert. I thought we had made a nobler king.” Robert’s face was purple. “Out,” he croaked, choking on his rage. “[...] Go, run back to Winterfell. And make certain I never look on your face again, or I swear, I’ll have your head on a spike!” - Eddard VIII, aGoT

“Gods have mercy,” he muttered, swallowing his agony. “The girl. Daenerys. Only a child, you were right . . . that’s why, the girl . . . the gods sent the boar . . . sent to punish me . . .” - Eddard XIII, aGoT

Robert is a man who always wants it easy, he wants his demands to always be fulfilled, to be loved and have fun without dealing with the bad things; but an important theme that is repeated over and over in asoiaf is that you can only act good if you are willing to face the bad that may come with it, and if you cannot live with the consequences, your action might not be justified.*

Bran thought about it. "Can a man still be brave if he's afraid?" - "That is the only time a man can be brave." - Bran I, aGoT

"Sacrifice . . . is never easy, Davos. Or it is no true sacrifice." - Davos VI, aSoS

"The blood of the First Men still flows in the veins of the Starks, and we hold to the belief that the man who passes the sentence should swing the sword. If you would take a man's life, you owe it to him to look into his eyes and hear his final words. And if you cannot bear to do that, then perhaps the man does not deserve to die." - Bran I, aGoT

Ned stood, gently disengaging himself from Sansa's grasp. All the weariness of the past four days had returned to him. "Do it yourself then, Robert," he said in a voice cold and sharp as steel. "At least have the courage to do it yourself." - Robert looked at Ned with flat, dead eyes and left without a word, his footsteps heavy as lead. Silence filled the hall. - Eddard III, aGoT

This is why putting him on the throne was poison - all the power in the world, and noone who would dare go against his wishes. It indulges all of Robert's worst traits, and buries anything he had inside him that was salvageable.

Ser Barristan Selmy spoke up. "Your Grace," he said, "it is not seemly that the king should ride into the melee. It would not be a fair contest. Who would dare strike you?" - "Ser Barristan is right. There's not a man in the Seven Kingdoms who would dare risk your displeasure by hurting you." - Eddard VII, aGoT

I am surrounded by flatterers and fools, the king had insisted. Ned looked down the council table and wondered which were the flatterers and which the fools. He thought he knew already. - Eddard IV, aGoT

And Robert knows it - he knows being a king isn't for him, that he doesn't enjoy the actual work that goes into governing, that he doesn't have the personality for such politics or to deal with the people involved, and that he would much rather spend his time enjoying life and doing what he loves...

"Look at what kinging has done to me. Gods, too fat for my armor, how did it ever come to this? [...] I swear to you, I was never so alive as when I was winning this throne, or so dead as now that I’ve won it." - Eddard VII, aGoT

"I swear to you, sitting a throne is a thousand times harder than winning one. Laws are a tedious business and counting coppers is worse. And the people … there is no end of them. I sit on that damnable iron chair and listen to them complain until my mind is numb and my ass is raw. They all want something, money or land or justice. The lies they tell … and my lords and ladies are no better. I am surrounded by flatterers and fools. It can drive a man to madness, Ned. Half of them don't dare tell me the truth, and the other half can't find it. There are nights I wish we had lost at the Trident. Ah, no, not truly, but …" - Eddard I, aGoT

Robert groaned with good-humored impatience. "If I wanted to honor you, I'd let you retire. I am planning to make you run the kingdom and fight the wars while I eat and drink and wench myself into an early grave." - Eddard I, aGoT

"Let me tell you a secret, Ned. More than once, I have dreamed of giving up the crown. Take ship for the Free Cities with my horse and my hammer, spend my time warring and whoring, that's what I was made for. The sellsword king, how the singers would love me." - Eddard VII, aGoT

And yet he doesn't do anything about it and keeps staying at the position he hates - he does not want to deal with the uncomfortable consequences that would come with upsetting the status quo, or making changes to his own personality and going through growth, or confronting ugly truths about himself in a productive way, etc etc.

He does make a talk of changes at times during aGoT, and seems to have a sense of responsibility about his Job, but as it is his desire for changes came too late, and what responsibility he felt mostly served to paralyze him in place.

"The sellsword king, how the singers would love me. You know what stops me? The thought of Joffrey on the throne, with Cersei standing behind him whispering in his ear. My son. How could I have made a son like that, Ned?" - Eddard VII, aGoT

"I'm still young, and now that you're here with me, things will be different. We'll make this a reign to sing of, and damn the Lannisters to seven hells." - Eddard VII, aGoT

In a way Joffrey is to Robert what Ramsay is to Roose: an exploration of the inherent flaw in their way of life, demonstrated in the most extreme case. In Joffrey's case, it shows what happens to give someone unlimited power with noone daring to oppose them.

Do you think that if the war never happened that he'd still go down this self destructive path?

It's a little unclear which war you mean, so I will briefly touch on several points:

There could have been ideal circumstances where he might have worked out as a king, if he was surrounded by people who know the perfect way to deal with him and make him work past his flaws (intuitively doing the work of a modern therapist), but the average life is not ideal and grrm shows the realistic fate of a man like Robert.

I think by the time Ned arrived it was sadly too late to change - maybe if the Lannisters didn't exist, or this or that event hadn't happened, but Grrm shows that most of what lead to Robert's downfall was in the end caused by himself. Cersei kills him because she came to despise the man he was, and for good reason as he abused her during all her marriage - and while he has some scenes of feeling bad or even apologizing for it, he never made any attempts to actually change the terrible way he was treating her.

If Robert's Rebellion never happened, he would have probably made an able enough Lord of Storm's End; delegating his "boring" administrative duties to his advisors and maester, enjoying the privileges of highborn life, and having just enough responsibility to feel like the alpha male of his society yet not enough to do as lasting damage as he did for the throne. He would not have been the best Lord, but sadly there are many worse in Westeros, since the entire dynastic ruling system is inherently flawed. If he would have been a better person depends on who he is surrounded with, if circumstances would have motivated him to change, or if perhaps his position of power and outward influences would still just have indulged him into the man he was in aGoT. Ultimately, there are a lot of butterfly effects leading to different results that i’m sure have been explored in many fics.

"Love is sweet, dearest Ned, but it cannot change a man's nature." - Eddard IX, aGoT

This was the boy he had grown up with, he thought; this was the Robert Baratheon he'd known and loved. If he could prove that the Lannisters were behind the attack on Bran, prove that they had murdered Jon Arryn, this man would listen. Then Cersei would fall, and the Kingslayer with her, and if Lord Tywin dared to rouse the west, Robert would smash him as he had smashed Rhaegar Targaryen on the Trident. He could see it all so clearly. - Eddard VII, aGoT    

What do you think of Robert?

Since i am someone who frequently enjoys morally grey and villainous characters, despite his many negative traits i have a fondness of Robert; I think he is an interesting character and very human in his flaws, and there is a lot of melancholy to his story that makes me somber about him even if it obviously does not excuse his bad actions. I also think he has a great character design that's fun to draw and some fun boisterous scenes, and some of his positive qualities remind me of people i know.

*Stannis is an interesting character as Robert’s brother, as he is the opposite to him in this regard, as well as in many aspects of their personality and even their outward presentation (like how Stannis crops his beard short to contrast Robert’s wild one)