PS3/Xbox: Most powerful, everyone thought it would win, but it sucks because of lack of good games.
Xbox360/PS2: Not as powerful, but because it got a head start in the console race it secured the most exclusives and thus will be likely to win over most gamers.
Wii/Gamecube: Nintendo. You like it or you hate it. Nintendo.
PC: The "Cool" kids use it because it's too "DEEP" for the rest of us