I'm definitely not in the majority here, but this movie just didn't do it for me. The same story as the first is remade, with a few new elements, but even the new elements aren't that good and treated with an absolute disrespect for the character. Stark's alcoholism is comical at best instead of being dramatic, his sickness is way too exaggerated for the impact it truly has on the rest of the story. The finale shows many armors, "Phantom Menace" comes to mind, but even more flat.
Robert Downey Jr. still delivers a worthy performance, the special effects are great, and even though Sam Rockwell plays a caricature, although he feels like he's enjoying himself quite a lot, which helps, but having Nick Fury to force the story to go forward doesn't make for a better storyline or a nice pacing.
At least, the second disc contains loads of great special features, because otherwise this set wouldn't be that interesting (for my tastes).