We saw Iron Man 3 last night; it was really quite good. Not sure there's much else to say about it - there's not a whole lot of subtext or deep character stuff to go into. The CGI was remarkably low-key, considering the big explosive effects finale; there was only one shot, that I can remember anyway, that didn't look up to scratch.
It was also, thankfully, not as indulgent as I was expecting for a third-in-the-franchise superhero film. They tend to get a bit bloated and drag in more villains than the plot can comfortably support, but it seems Iron Man got that out of its system with its second outing.
I've been thinking about what Iron Man 2's flaw was, for me; I've still only seen it once and might re-evaluate it in the event I ever give it a second viewing, but I remember it feeling like a movie version of a TV show. It's got all the big-budget spectacle of a blockbuster, but it's trying not to upset the cart with any story or character beats because they want to save that for the next one. As a result, it's treading water to an extent - there's lots of splashing, but it doesn't go anywhere.