You are usually screwed in this case anyway. My tactic is strafe while spinning anyway.
Well, assuming you are going to use that controller for Brink as well, it could be the difference between having a chance of returning fire when someone gets you from behind, or dying before you even have enough time to turn around.
But then again, when i played console, i would keep my sensitivity at max for that very reason, so i might be a bit biased. No one ever caught me off guard from behind though.