It's a damn fun movie and infinitely watchable, but it's not really the 'end game' I was anticipating. Actually, of all the Marvel movies so far, this one is the least consequential and makes the least impact. Yes, it's a great popcorn movie that does all the things this movie needed to do right and it does it extremely well. Characters are fun and the interaction between them dynamic and entertaining as all get out, but after that there's just...well, there's just not much there. A MacGuffin makes the Avenger's assemble to beat a bad guy the film goes out of its way to make as un-threatening as possible leading to the least interesting version of the 'movie length final battle' I've seen so far.
You heard me, I just pointed out something Transformers 3 did better than this film.