Is one good game enough to make you purchase an entire system? The New Super Mario Brothers Wii came out today, and I'm contemplating picking up a Nintendo just for this game. I know there are many other killer titles available (Zelda, Super Smash Brothers, etc) but none of them alone are enough to make me swing and flick my way through a game.   Would you buy an Xbox just for Halo or a PS3 just for Resistance?  Am I alone on this?