My topic is about PC Gaming
For me the top 5 sites that i depend on game reviews are:
1. IGN.com
2. Gamespot.com
3. Gamepro.com
4. Pc gamer.com
5. Gamespy.com

These site are mostly credible and also the fact that it give a prefect review on the games that you are interested on . The sites give the full details about the games and the pc specification as well show trailers about the game your are interested. I prefer to this sites not only for the reviews but also for the updates they give be it on launch of the new games or updates for the released games so if at all you want to check about the game you want, you know where to look for :)