I was wondering which RPGs I've missed. I don't think there is a better place than this forum to compile a good list. I'll start with the ones I have played (in no order).
The ones I like-
Witcher Witcher 2 Neverwinter Nights Neverwinter Nights 2 Knight of the Old Republic Knight of the Old Republic 2 - Sith Lords Gothic 3 Dragon Age - Origins Mass Effect Mass Effect 2 Mass Effect 3 (meh....) Drakensang - the Dark Eye Drakensang - River of Time Spellforce 2 (RPG-RTS hybrid) Fallout - New Vegas Divinity 2 - the Dragon Knight Saga Risen Risen 2 Titan Quest Vampires the Masquerade - Bloodlines
Gothic 1 Gothic 2 (wih NotR add-on) Arx Fatalis Fallout 1 & 2 Vampire: The Masquerade – Redemption (not a great game like Bloodlines but still fun to play) System Shock, System Shock 2 & Deus Ex (not really RPG games, more of a mix between RPG and survival horror/FPS/ stealth game)
Planescape Torment Temple of Elemental Evil Dungeon Siege II Fallout I Fallout II Baldur's Gate I Baldur's Gate II Freedom Force Dungeon Siege II The Last Remnant (JRPG with an interesting twist)
Those are just PC games since I'm almost exclusively a PC gamer. There are countless console RPGs that are fantastic though. Handhelds also gets some incredible RPGs. There were tons of great RPGs for the GBA.
Strange women lying in ponds distributing swords is no basis for a system of government.
Deus Ex and System Shock 2 my personal favorites but also: Deus Ex - Human Revolution Vampire the masquarade: Blood Lines Gothic 1-2 KOTOR Fallout 2 Fallout New Vegas Baldurs Gate 1-2 Planescape Torment Dragon Age Morrowind Icewind Dale 1-2 Risen 1 The Witcher 1-2 Mass Effect Drakensang Neverwinter Nights Wizardry 8 Freedom Force Might and Magic VI: The Mandate of Heaven