-Neverwinter Nights and KotOR - These were the first (western) RPGs that I've played. I enjoyed KotOR at that time but after playing better RPGs such as Bloodlines and IE games, I can't get back to it.
-Morrowind - The first and only Elder Scrolls game that I've played.
-Vampire: The Masquerade - Bloodlines - My second favorite game (after BG2).
-Fallout 2, 3 and New Vegas - Like KotOR, I enjoyed Fallout 3 when I first played it. I can't go back to it after playing New Vegas.
-Mass Effect series - I used to like them but ME3 destroyed the entire series for me.
My backlog (started but haven't played enough):
-Temple of Elemental Evil
-Deus Ex
-Fallout