I agree, Will Smith really proves his acting chops here (as if he didn't in Pursuit of Happiness), I really bought his devastated, lonely character and the world he lives in.

As for the CGI effects, I was very disappointed. What did CGI offer that good makeup and stuntwires couldn't? I think a slightly slower monster would have been more effective instead these superspeed zombies. If they had been real actors, it would have worked better. Hollywood really has to get over this CGI fascination and get back to some roots.