Command and Conquer,
Command and Conquer: Tiberian Sun,
Command and conquer 3 + Kanes Wrath expansion
Command and Conquer Generals (for killing the good rep of C&C) + Zero Hour Expansion (for restoring said rep)
Command and Conquer Red Alert 1, 2 and 3 + associated Expansions (Two most noteworthy)
Elder Scrolls 3: Morrowind + expansions
Elder Scrolls 4: Oblivion + Shivering Isles
Mass Effect
Pokemon line of Games (when will they stop making them?...)
Battlefield 2
Unreal
Unreal: Return to Na Pali
Unreal 2
Unreal Tournament
Unreal Tournament 3
Prey
Gears of War 2
Neverwinter Nights 1 & 2
Neverwinter Nights Expansions (Separate cuz they are better that originals)
Neverwinter Nights: Hordes of the Underdark (Separate again cuz it the best i have played yet)
Baulders Gate
Baulders Gate 2
Icewindale series
Fallout Series
Recoil (great game, if u see it, get it)
Supreme Commander + Forged Alliance
Final Fantasy Series
Starcraft + Expansion
Legend of Zelda series of Games
Donkey Kong 64 + other donkey kongs that are on older consoles
Super Mario 64 + older ones
Super Smash Bros. line of games
Fable
Fable 2
Heros of Might and Magic 5
Diablo
Diablo II + Lord of Destruction
Freelancer
X
X2: The Threat
X3: The Reunion
Warhammer 40,000 Dawn of War
WH40kDOW Winter Assault
WH40kDOW Dark Crusade
WH40kDOW Soulstorm
WH40kDOW II
Starwars: Knight of the old Republic 1 & 2
Starwars: X-wing vs. Tie-fighter
Starwars: Empire at war + Forces of Corruption
Starwars: Jedi Knight line of games
Resident Evil 2, 3 and 5
Fear 1 & 2 (expansions not worth mentioning)
Banjo-Kazooie
Banjo-Tooie
Turok: The Dinosaur hunter
Turok 2: Seeds of Evil
Turok 3: Shadows of Oblivion
Perfect Dark
Perfect Dark Zero
Devil May Cry 1
Devil May Cry 2
Devil May Cry 3
Devil May Cry 4
Starwars: Rouge Squadron
Starwars: Rouge Squadron 2
Jet Force Gemini (NEEDS A SEQUAL!!!)
Armoured Core Series of Games
Metal Gear Solid 1, 2, 3 and need to play 4
Starwars: Podracer
and thats all i can think of at the moment...
Oh and of course ToriBash