Mafia. Taught me that games shouldn't snuggle me, and that good, intelligent writing can (and should) exist within a game.
(Although I think I actually played The Sands of Time first, so perhaps that. Again, for the writing; the character development and relationship between the two in particular.)
(Although I think I actually played The Sands of Time first, so perhaps that. Again, for the writing; the character development and relationship between the two in particular.)