I guess you missed some of the movie.
The Hawkeye parts at the beginning were pretty great, to be honest. They grabbed my eye, but mostly because I expected more or less the other things.
The Hulk was really funny--I mean, I don't mind a joke here or there, but it made him seem like an idiot and I didn't like that. I don't want the Hulk to be the comedy-relief in that way, in comparison to beating the living crap out of Loki. That kind of funny was nice.
That part with Bruce and the joint snake-like thing, that was incredible.