I’ve played all 3 of the new systems, Wii is without question the most fun to play, hands down.
If you like sitting in a dark room by yourself, playing first person shooters against people from around the world, and need as much realism in the blood splatter as possible, 360 and PS3 are fine machines for that.
If you like to have fun, Nintendo console is untouchable.
“fun” is relative...