MetaCritic:
http://www.metacritic.com/games/ is what I use for all my review needs.
As for comparing games on different systems, it usually comes down to whichever system I own wins :P
The Wii game is going to be vastly different from anything else. But the difference between a PS3 game or an Xbox360 game is probably going to be negligible. My standard recommendation these days is to pick the one who's controller you prefer. Feature wise there usually isn't a difference.