Oh if you are trying to get a poll between the three, won't it not be better to ask for a comparison rather than a poll? The most owned set may not be the best.
In my view:
PS3 - too little games and no friendly games.
Xbox - games geared towards hardcore or expert gamers.
Wii - games geared towards kids, family friendly games, or games which you can pick up and play without reading walkthroughs or the like.
That's the reason why I got PS2 and Wii.