I peruse
www.game-revolution.com myself, unlike almost all the other review sites they have no numerical grading system; they use a scholastic letter grade +/- system instead. As for the accuracy of the reviews, look up a few titles you own and see if their viewpoint doesn't match yours after playing it. Most good games end up with some variation of a B, ones with promise that have major detractions end up with a C, painfully bad games usually end up with a D.
F, now that's a category reserved for crimes against humanity for the most part, and if they give that to a game it means there's no redeeming aspect to it whatsoever. Technically there isn't a real F- grade, but one game was
so horrible it got one. The review for the game is way more fun then playing it could ever be (and it's interactive! Choose your insults!).
Really good games get the A-, with the truly exceptional/revolutionary titles awarded an A. A grades are relatively rare, unlike 10/10 scores on other gaming sites.
They don't have anything like the pull the other game review sites wield, so they don't get sent copies of every title under the sun. If it's a major release they'll probably cover it though.
For an example of the rarity of the A grade, here's how many PC games got one:
Titles starting with A: 0
Titles starting with B: 3 (Baldur's Gate, Bioshock, Black & White)
Titles starting with C: 1 (Counterstrike)
Titles starting with D: 2 (Diable, Dungeon Keeper)
Titles starting with E: 1 (The Elder Scrolls II: Daggerfall)
Titles starting with F: 1 (FIFA '99)
Titles starting with G: 2 (Grand Prix Legends, Grand Theft Auto: San Andreas)
Titles starting with H: 1 (Half-Life)
Titles starting with I: 0
Titles starting with J: 0
Titles starting with K: 0
Titles starting with L: 0
Titles starting with M: 1 (Mechwarrior 2: Mercenaries)
Titles starting with N: 1 (Need for Speed 3: Hot Pursuit)
Titles starting with O: 1 (Omikron: The Nomad Soul)
Titles starting with P: 0
Titles starting with Q: 0
Titles starting with R: 1 (Roller Coaster Tychoon)
Titles starting with S: 1 (System Shock 2)
Titles starting with T: 2 (Thief: The Dark Project, Tomb Raider)
Titles starting with U: 0
Titles starting with V: 0
Titles starting with W: 0
Titles starting with X: 0
Titles starting with Y: There aren't any reviews for PC games starting with Y.
Titles starting with Z: 0
Titles starting with some other character: 0
18 in total, which goes to show they don't give that out at the drop of a hat. For those wondering: Freespace 2 got an A-.