There seems to be this assumption that Alex Cross is some kind of uber badass. He's not. He's certainly capable of it, but most of the time, Cross is an intelligent, well spoken, calm, and often polite person.
I don't hate the trailer. It's not very impressive, but Perry certainly fits the role better than I thought he would, and he does seem to have some ability to play both the calm, intelligent side of Cross and the more agitated and intense one. So the range of emotion that Cross is known foroii probably there. I don't think he looks stiff in the trailer so much as he looks measured, which is what Cross is. He seems to be handling the action stuff well enough. The story itself looks a bit simple, but I haven't read CROSS yet, so can't really comment on that.