IGN.com is what I usually use for everything, including PC, Playstation and XBox. They've got they're own reviews and scores, a conglomerate of other critic's scores, and also an area for users to post their thoughts and scores as well.
gamespot.com is decent. I used to like its layout better than IGN (like 5 years ago or something) so got in a habit of going to gamespot more. Now I use them both.
A lot of my friends don't agree with a lot of gamespot's rating (I'm not sure about IGN).
But those are definitely the 2 big ones. Pretty similar imo.
http://www.tech-olive.com/ is a good one it was started by a couple of boffins from here![]()