I Want
The Elder Scrolls IV: Oblivion (PC)
The fourth Elder Scrolls entry is utterly brilliant and should not be missed by any adventure-spirited gamer.
Star Wars Battlefront II (PC)
Teams of players can shoot it out in sprawling Star Wars battlefields or hop into a TIE fighter for small-scale dogfights.
Star Wars: Knights of the Old Republic (PC)
This is a Star Wars prequel done right - with nary a Gungan in sight.
I've Beaten
Left 4 Dead (PC)

An incredibly tense multiplayer experience like no other. A must buy for shooter fans.

I Love
Fallout 3 (PC)
The freedom may scare people used to more linear shooters and the simplified customization might disappoint hardcore RPGers, but if ever a game was worth broadening your horizons for, this ...
Grand Theft Auto: San Andreas (PC)
A hell of a lot of fun, even when the cops are chasing you around town.