compare gran turismo 4 with forza motorsport on xbox.more cars,more stages etc but the same gameplay,with the old ai that cars go on the same routine and graphics with jagies.now if you say that the demo of gran turismo 5 is only a demo and it does not show what the game will be just compare it with the demo of forza motorsport 3.far more detail,physics,and damage,great controls and the ability to turn back the time compared to what?a monotonous stage,ridiculous driving phusics and no damage.