I saw Iron Man 3 as well. I left the theater feeling highly disappointed. I thought the movie just wasn't very good, and a very specific reveal in the plot creates a gaping hole. It should have been called: Robert Downey Jr., the Official 007 Parody. It felt as though Iron Man actually had less screen time than he did in the first film, and that's saying something. Furthermore, the antagonist is the Mandarin, but it's hardly even the Mandarin. The confrontation between Iron Man (hardly) and the Mandarin is actually kind of cool looking, but it's almost as brief as one of the zillion one liners that RDJ spits out over the course of the movie. What really killed it was how the Mandarin is finally defeated. If it doesn't leave you rolling your eyes, and/or face-palming, I don't know what will.
The only positive is that it's the first 3D movie I've seen where the 3D wasn't a distraction. Oh, and the trailer for Superman was neat.