Iron Man 3 
Let me preface with I really, really enjoyed Iron Man. Going in with no expectations, it was a blast to watch in character and story.
Iron Man 2, I've already forgotten so much about it.
Iron Man 3 did absolutely nothing for me. It was so far removed, IMO, but maybe the 3rd story is where they wanted to be in the Iron Man world. To me as a casual viewer, Iron Man 3 had many distractions. First the kid, that came out of nowhere and didn't add much, except said distraction. Then Tony Stark totally losing his **** and getting an anxiety attack, just seemed odd. And then I am STILL having a hard time reconciling his world with Aliens and Gods from a different world. Several times it was dealt with in the movie with him shrugging it off.
The special effects just got into the Super Hero world where the Iron Man suit has a life of it's own.
Ugh.
So disappointed, I know It will be sometime before I want to spend anytime watching it.
http://www.youtube.com/watch?v=2CzoSeClcw0