And it is bloody good! Great special effects and acting. What I really loved was the believability, that that suit is really possible with today's technology (almost). Also there was a certain depth of character, not just good-guy-bashes-macho-egoistic-bad-guy.
And the script writers did well to put some humour. The best was probably the excess charge on the repulsor thing which resulted in Stark hitting the walls.
Perhaps it was too realistic, there wasn't any stunned expression as I left, the kind that happens after living in a fantasy world for 2 hours. 4/5