Gametrailers. They gave Game of the Year 2008 for three platforms (PC, PS3, and Xbox 360) to GTAIV... Which from what I heard is the worst GTA by fans, and having playing it myself I wasn't too pleased with it either.
I don't really care for reviews anymore. I used to be the type of gamer that would only buy games if they got great reviews like 9 or even a 10, but having abandoning that way of thinking long ago I got to play a lot of great games I would have missed out on over the years.
I really do hope gamers don't let these reviews decide on whether they should buy the game or not.