I saw Iron Man 2. I thought it was about as good as it could have been. I didn't appreciate the change in actor for War Machine's character, but meh.. what can you do?
I was going to say that Don Cheadle wasn't tough-looking enough. Then I recalled Rhodey from the first Iron Man movie, and realized he wasn't either. Then I tried to find a picture of him from a comic. I found this: