It all depends on the player preference.
The Wii is more for kids and family fun.
The Xbox 360 is good for the average gamer. Has the best online capabilities and a wide variety of games.
The PS3 is more for the gamer is depends most on graphics and shiny game play, which is why the PS3 sunk. Sony focused too much on that, while not enough on online play.
@Chingy- Xbox Elite is already out.
'Nuff said.