There is basically one game-review site I really trust, Giantbomb.com. The site was created after Jeff Gerstmann was fired from GameSpot for giving a bad review to a game whose advertising was all over the site at the time[1].

I don't know how impartial they really are, but one of my favorite parts of the site are their Quick Looks. It's just a couple of people playing a game and talking about it. It feels like it gives me a good representation of what to expect from a game.

1. https://en.wikipedia.org/wiki/Jeff_Gerstmann#Termination_fro...