Actually, the Middle Eastern guy didn't surrender really. He just sat there and insulted him. I'll agree that was slightly execution-esque, and was totally unecessary, and probably would have found, in a real world situation, a Captain America in the brig waiting for review.
However, this Cap is not a thug. Bully? Sure, to some extent. Anybody with large amounts of power is destined to become some form of bully or another. But I wouldn't say he's all out.
I've already said how kicking Bruce was unecessary, and it was, but the Hulk DID just trash a good chunk of town and kill hundreds of people that Cap has sworn to protect.
Though I don't agree with the method, he beat up Pym for beating up Pym's wife, which was, back then, considered fairly virtuous, as he was basically handing out justice. But he, by no means, stole Janet from Pym. Janet, being the ****e she probably is like every other female in the Ultimates Universe, went to Cap.
He confronted Thor in a fairly innappropriate manner by just going out in public like that and yelled at him, but the other option was skulk around and avoid the subject forever until Thor came to them. Or I guess you would have preferred the "honorable" way of tricking him into the wilderness or something. Thor is ALWAYS around his followers, and spreading his word. Chances are the only way to talk to Thor at all was the large scale attack they DID later in that series. So the yelling at Thor thing was actually fairly fine, since the circumstances were fairly sensitive. And he wasn't shamed into leaving really, since Cap wasn't looking to smash his face in and was really only there to confront him with these circumstances. And granted, if someone told ME that some Asgardian trickster god did all these things, I'd probably think him crazy too. Any rational person would. That's why they call it rationality, and not faith.
Flame thrower on Thor? I don't know. Because it totally made sense to me that a small discus to the head would've worked tons better against a raging mad attacking superhuman considered to be the most powerful in the world by SHIELD. And judging how Thor has a high level of durability that involves getting in fights with the Hulk and come out without scars? I'm thinking a flamethrower just wasn't going to do much.
And if you think the 616 Cap is super high moral and high road type, you can also think again, as he does tons of behind the scenes work, not to mention instigated fighting on a large scale with the Civil War, when doing a political stand would've worked far better and quicker.
But hey, who knows? People just like biased arguments.
Ultimate Cap is a soldier. Pure and simple. Does what he's told, and holds up his moral beliefs. Not yours, definitely not mine, and not Tony Stark's or Thor's or anybody elses. Just his and his alone. Which is basically IDENTICAL to the moral structure of Cap in the 616, only Cap in the 616 will more frequently question his orders from time to time.