Auto-aim, which is actually called aim assist, is the only thing that could make console players competent against the mouse and keyboard. Without aim assist, you're practically helpless and anybody that tells you otherwise has not turned it off before.
Again, it isn't auto-aim. It just reduces sensitivity when aiming at an enemy.
Again, not even autoaim or aim assist whatever you wanna call it, will help you anything against a PC player with a mouse.