I don't really have a best or worst review site. If you watch any of them closely enough, you will see that they have all done some questionable reviews. That includes nearly everyone's favorite, IGN.
Personally, I go to gamerankings, and I read the highest, lowest, and a middle review. That gives me a very good picture of what the game does well, and what it doesn't do so well.
Now that I think about it though, gaintbomb is a pretty poor review site in my opinion.
NNID: theRepublic -- Steam ID: theRepublic
Wii U - Currently Gaming Like It's 2014 (Hyrule Warriors) - 11 games in backlog
3DS - Currently Gaming Like It's 2013 (Luigi's Mansion: Dark Moon) - 7 games in backlog
PC - Currently Gaming Like It's 1998 (Half-Life) - 5 games in backlog
Mobile - The Simpson's Tapped Out and Yugioh Duel Links