2004 is far and away the best year in video gaming history with regards to highest quality of games.
Unreal 2
Ninja Gaiden
Metal Gear Solid The Twin Snakes
Rainbow Six 3
Battlefield Vietnam
Unreal Tournament 2K4
Far Cry
Final Fantasy XI
Fight Night 2004
Painkiller
TOCA Race Driver 2
Rise of Nations
The Chronicles of Riddick: Escape from Butcher Bay
Psi-Ops: The Mindgate Conspiracy
Spider-Man 2
Tales of Symphonia
Doom 3
Burnout 3: Takedown
Call of Duty: United Offensive
Fable
The Sims 2
Warhammer 40,000: Dawn of War
Star Wars: Battlefront
Katamari Damacy
Rome: Total War
Tony Hawk's Underground 2
Paper Mario: The Thousand-Year Door
Ace Combat 5: The Unsung War
Dead or Alive Ultimate
RollerCoaster Tycoon 3
Grand Theft Auto: San Andreas
Counter-Strike: Source
Ratchet & Clank: Up Your Arsenal
Halo 2
Need for Speed Underground 2
Half-Life 2
Vampire: The Masquerade - Bloodlines
Metal Gear Solid 3: Snake Eater
Alien Hominid
World of Warcraft
Prince of Persia: Warrior Within
Star Wars: Knights of the Old Republic II The Sith Lords
The Lord of the Rings: The Battle for Middle-earth
Look over this list multiple times. It's simply incredible that like 15 of the best games ever all came out in a matter of months.