Mistake #1. Replacing Terrance Howard with Don Cheadle. While Cheadle is a very good actor, he does not fit this part, not to mention the loss of the effective interaction between Howard's "Rhodey" and Tony Stark. Cheadle's "Rhodey" just didn't work. Mistake #2. Then there was the ridiculous addition of Scarlett Johansson as Natasha "Black Widow" Romanoff. How about an actor that could have really pulled it off, like Summer Glau. She has the body, the look and the skills to have made you go "WELL". And 'good Lord', Mickey Rourke. Why don't someone take that guy to see a doctor, or a group of them. Psychiatrist/Dermatologist/Plastic Surgeon, in that order.