It looks CRAP. Kinda like a million dollar CGI fest with Will Smith. Think of this logically and you end up with a big pile of crap. Computers have instant reaction times, hence if you tried to beat up a robot you would be dead. Plus programmers would not allow robots to turn against humans unless the story is about someone who programs the robot to kill everyone but that would be pointless.
no flaming please.
also another thread is here on i robot.
http://www.killermovies.com/forums/showthread.php?s=&threadid=23176&highlight=i+robot