The Avengers
Big budget booms and smart dialogue. Loki is a good fit for Whedon - he loves screwing with characters' minds. And for the first time, there were scenes that actually made the Hulk scary, and believably furious. I really want to see a Mark Ruffalo Hulk movie. (I think they based this Hulk's movements on gorilla stances and movements. It works to give him apparent weight and threat.)