The emotional impact of the Incredibles (like all Pixar movies) is definitely what carries it to the top. Has-been father goes through mid-life crisis, tries to recapture youth but becomes distant from his family, and in the end reaffirms the importance of his family (that is, his present and future, not his past) above all else. The emotional climax of I can't lose you again is far above anything offered in the Avengers. With so much screen time dedicated to setting up a team, though, and each character having so much pre-existing baggage they had to fit in, it's understandable that the Avengers couldn't quite plumb the emotional depths yet. I will be disappointed, though, if A2 doesn't try to offer more than smash and laugh.