Lots already mentioned:
- the campus scene. Although some of it was spoiled in the internet videos, the sonic cannon scenes worked out WAYYYY the hell better than I was expecting. You see, that's the type of weapons I want to see in a Marvel Super Hero movie. Very comic booky, but implemented in such a way you could believe they worked.
- the final fight, it certainly did work for me.
Something that wasn't mentioned specifically:
- cave scene:
I loved when the thunder is heard and hulk is surprised and starts growling at the sky, did you all notice what he does? He gestures one of his hands back, towards Betty, basically saying "stay back, I'll protect you". It was a subtle detail that just a great scene even better.
- the pizza guy, come on, his name is Stanley... Stan Lee. Didn't anyone notice they even had him kind of looking physically like Stan the Man?