I'd really give it a 4.5 if they allowed that kind of rating. I thought this was another good movie adaptation of one of Marvel Comic Books. Robert Downey Jr. played his part well. He wasn't quite the hard guy I remembered Tony Stark being and was more comedic but it was still good. Actually the humor mixed in with the action of this movie was very enjoyable. It's definitely a must see and I will own it as soon as it comes out.
And wait for after the credits to see a little teaser. The majority of the theater I was in had already left, but I know how they do things.