What is up with gamepot? How does a game taht is suppose to be made for PC get a lower score than the one on Xbox 360?

Why does Oblivion for the PC get 9.3?http://www.gamespot.com/pc/rpg/theelderscrollsivoblivion/review.html?sid=6146657

 And the one for Xbox 360 get 9.6? http://www.gamespot.com/xbox360/rpg/theelderscrollsivoblivion/review.html