Good points.
Ok but what about the fact that Sentry is basically a blond haired version of superman, and is probably capable of moving at comparable (he can snatch bullets, fly to the sun and back in minutes) speeds?
The writers didn't factor those attributes for when the Sentry fought hulk during the world war hulk arc.
So either Hulk can get transcendentally angry enough to match superman's speed, or superman gets somehow gets nerfed for the sake of a story so the fight actually takes place.
If not, then Hulk and the Avengers die quickly and horribly.
Another thought concerning the Hulks power: Does he have an actual limit? At one point he was so pissed that he was begging Dr. Strange (?) to send him to Negative Zone before he broke the world
Also: I wonder if having two great minds like Tony Stark and Bruce Banner working together with prep time against superman would make a difference? With a collaboration of those two formidable minds (think maybe Reed Richards and possibly Doom, are the only ones smarter) using SHIELD/Stark- tech and resources in conjunction with a rune-enhanced Thor, with Captain America pulling some tactical heroics, and spiderman convincing hulk that superman rape-fucked hulks pet kittens to death, I'm still convinced the Avengers might win.