Ironman 3 (Extremis)
I wasn't as impressed as a lot of others. Not a bad movie, I thought IM 2 was actually bad, but not on par with the first. I found the way they handled Mandarin to be one of the worst decisions in superhero movie history right behind adding nipples to Batmans costume. I'm shocked Marvel/Disney let them go that route with one of the better Marvel villains.
Ultimately I think Joss Whedon understands and handles the character better than anyone else. One of the things I like about Tony Stark is he's damaged but not in the way this movie presents him.
I do like that they showed a lot of Tony Stark action outside of the suit. That was good. I don't like that for the second movie in a row they show very little action in the suit until the climax. At least the climax in 2 was good. I found this climax lacked punch.
Overall I say see it as part of the Marvel Universe of movies. If it were a standalone film I'd probably say you could skip it.