Saw Iron Man 3 today. It's very rare I watch a film in 3d but opted to do so on this occasion.
Very good film. Love the Marvel films, and this is one of the best. And as others have said, Paltrow is fine!
Don't bother with the 3d version if you go to see it, though. As seems to usually be the case with 3d films it adds nothing. A few scenes it worked really well, most of the film it was pretty much unnoticeable, and a few scenes it was a bit of a blurry mess seemingly designed to induce a migraine. May be just me though.