I wouldn't consider myself an expert, but I think it's nice for the guys that they look better than they looked before. It might help them get more girls, have more fun at parties, and feel better about themselves. Will it better prepare them to play football at a higher level? I don't know, but I don't see how putting a crossfit program together is good for football.
I know, I know--it pushes you to your limits! It forces you to tough through stuff! It's like the military!