I have to say - I really liked Ironman a lot. So much that I might see it again in the theaters if the opportunity presents itself.
It combined a pretty well-written, interesting storyline with humor (didn't take itself too seriously) and, believe it or not, pretty good acting.
A combination you don't see much in most superhero movies. They either have lousy acting, a lousy, tedious and predictable story, or take themselves WAY too seriously. In fact, they usually have a combination of the three.
The closest one I can remember that had the qualities I mentioned would be the Rocketeer.
