I thought Cheadle was good. As was Rockwell, even though he wasn't really given a whole lot to do.

My problem with the movie is that I know Stark is dying. The audience knows. No one else in the movie does, though. So it's tough to gauge how we, as the audience, are to react because the Stark that we know has always acted kind of drunk and kind of looney. He isn't an established enough character to be acting out of character - the Stark birthday party was supposed to show us how over the edge he's gone, but he's never really been on the edge, so to speak. At the end, when Pepper found he was dying - that was great. The dialouge there was snappy and fantastic, and I felt bad for her because she was kept out of the loop, but there was no sympathy for Stark in the movie. He came across as more whiny than anything else. I do love RDJr, though, and thought he was good, but too high spirited for a guy that was supposed to be coming to grips with his impending death. There were a few scenes where the true gravity of the situation came across, namely after Monaco when he asks Pepper to go to Venice with him, but outside of that, we're given no vulnerability. And because Stark being near death is essentially the meat of the movie, it comes across as shallow.