Even though the movie didn't have a huge gigantic climax, it was still great. I love how they based the MK3 model on Granov's design (or something similar) because that's honestly one of the better Iron Man designs in my opinion.
Downey also plays a great Tony Starks. Recalling his role in that one show--Ally Mc'Beal--I had my doubts about him, but he did a really convincing job. I'm glad he got casted xD
He seriously needs to wear thicker shirts, though--or at least a bra. Too much nipple action >_< CASE IN POINT!!!