The movie was OK, but not much more then that, in my opinion.
I really like the humor, RDJ does a great job with his lines (not surprising).
The villains were a credible threat in terms of how they match up to iron man, although a bit one note in their abilities.
The plot is a mixed bag. I kept wondering where it will go next, which is good. But looking back, I feel like it went nowhere. I still can't figure out what the bad guy's motivation was for what he did.
The 3D is superfluous. There isn't that much action in the movie (at least in relation to it's run time), so if were to see it again I'll go to a regular screening.