In no particular order:
Oblivion
Star Wars: Knights of the Old Republic
Jak 3
Oddworld: Abe's Oddysee
Final Fantasy VII
Uncharted 2
Legend of Zelda: Ocarina of Time
Call of Duty: Modern Warfare 2
World of Warcraft+expansions(quit for my own sake!)Warcraft III+expansion(these count as one!)