I've played Wii a few times and the controls aren't that great. The 360 is a median between the two.
With PS3, you get high quality graphics and a bunch of extra stuff (that you probably don't need) for a high price.
With Wii, you get some inovative features, the option to play oldschool games and that wicked "Wii-Wand!" However, if you're not into the whole "watch me pretend to play tennis, instead of acutally doing it!" then you probably don't want it. That's where I stand on this. Why would I want to make all the hand motions of playing tennis, when I could just go out and play it?
And then you have the 360. A classic console for the most part. It serves it's purpose with pretty graphics, an regular controller, and a (for most people) decent price tag for what you get.
Personally, I don't see myself picking up another nextgen console (I've got a 360). Niether the PS3's price tag or the Wii's "Wii-Wand" really makes me go "WOW!".
(i'm not going to spell check this. i'm sick)