I really didn't get into Iron Man 2, mainly because there was nothing heroic about it. Iron Man did nothing but save himself and his friends. Most superhero stuff eventually gets this way, and that's why I never got into it. The stories get too insular. For instance, in The Dark Knight, he's trying to save all of those people on the boats at the end...that's heroic. That was a great superhero story. But Iron Man was just fighting off robots that were attacking him...and then he gets a medal? Huh?
When Lex Luthor wants to detroy California, and superman has to stop him, that's interesting. But when Luther gets bent on destroying Superman, that gets kind of lame. It takes any real danger out of the story.