Oddworld games
Jak 2 (can't wait for Jak 3!!
)
FFX
Conker's Bad Fur Day (eh, I liked it)
Halo (it made you want more)
Red Dead Revolver (twas ok... but not great)
Starcraft
Starcraft Expansion
Warcraft 3 (not much different from Starcraft)
Warcraft 3 expansion (again, not much different from Starcraft)
Parasite Eve (I just love games where it ends and almost every citizen in New York is dead
)
just to name a few....