Iron Man 2 - I honestly don't see what's wrong with the movie, it's a lot ot fun. Pacing felt fine and does a great job of juggling multiple plot points in my opinion.
Watchmen - I thought it was good, not great. Don't see anything glaringly out of place though.
X-Men 3 - It's good for what it is, a popcorn movie, it's a fast food comic movie, but that's also what's wrong. We had two very intelligent X-Men movies, then we got this one. The casting was great though and we got to see Iceman and Pyro finally attack each other and Iceman fully iced up. It seemed like a movie that was rushed into and through production to either retain the rights and/or give Bryan Singer the middle finger.
Spider-Man 3 - There's a good movie in here, but it tried to do too much and use too many characters. You had Harry as the Goblin which the story needed, Sandman because Raimi wanted him and Venom for the studio. The big problem is none of them fit together, they all had separate storylines, just linked the three villians would've helped tremendously. Plus change Peter's story in the black suit from dancing on the street and asking for cookies to him spending far too much time in costume and starting to lose his morals.
Superman Returns - This was just boring and too much of a rehash of Donner's film. Let's hope Man of Steel gives Superman something to punch.
Hulk - This movie misses the mark so badly, the audience wants to see Hulk smash, not work out his daddy issues, but gets a couple extra points for the cool use of using panels to simulate a comic.
Amazing Spider-Man - Totally misses the mark on both Peter/Spidey and Lizard it's not even funny. Peter/Spidey being such a *****e and not giving the Lizard his family, kills both characters.