I agree with dazzy. I bought all three consoles because i see it like this: First and most i am a Nintendo fan boy but secondly i am a gamer and i don't want to miss games like GTA, MGS4, LittleBigPlanet, Halo, Fable II etc.
But i keep finding myself playing the Wii. First i thought "ok Wii has too many party games and i have my friends here and we have our fun".
But you know what? 14 days from now i'll buy GTA for either PS3 or 360 (i don't know yet) but something tells me that in 3 weeks i'll be playing Twillight Princess and i will trying to finish it for the 7th time!!!
Not because i won't like GTA.. But because Nintendo has something in their games that keeps me to go back. Call me what you want but i would play Wii Sports 4 players from GTA any time!