Although I still like Spider-Man 2, and think it's the best of the bunch. I just don't think it holds up very well against the high quality recent comic book films like Avengers, Iron Man, & Dark Knight. I can't even enjoy the 1st Spidey/Doc Ock fight because of all the screaming from random women, it's almost comical.
And just because, I love Avengers and a lot of other things Whedon does doesn't mean his opinion is gospel. He is entitled to his opinion, I just tend to disagree admantly with his opinion.