I think something that both the Spider-Man movies suffered from was the attempts to make it a typical teen drama with superpowers. There are too many scenes in these movies that show Peter's inner struggle, overkill Peter's crush on Mary Jane, etc, and having the villians/actual point of the movie to be secondary to the action. For example, in Spider-Man 2, it always seemed like to me that Doc Ock was a minor character, and it was in many ways a two-hour teaser trailer to whatever movie they finally have Harry Osbourne take on Spider-Man as the Green Goblin. I understand that some of the drama is very nessicary for the movies, but I think they really went overkill with it.