Since I was just linked here:
Iron Man 3 (3D) was pretty great; I thought it was the best in the trilogy, and especially pleasantly surprising after the letdown that was Iron Man 2. I think it was quite a nice end to the series, though it's probably not the end of the series.
I've never much liked Superman as a hero, but Man of Steel is looking fantastic. It reminds of The Dark Knight, and that's a very good thing.