Best game ever?
Here's my short list:
Baldur's Gate Trilogy: megamod installation - easy 200+ hours of gameplay, great characters, banters, romances, etc...
Planescape: Torment: one of the first to really bring role playing into a cRPG.
Vampire the Masquerade: Bloodlines - one of my most replayed games (clan quest mod rocks). Too bad they had to rush it at the end.
The Witcher: great story, graphics, characters, music - this one got about everything right (and no DRM as of Enhanced Edition).
Knights of the Old Republic: Another one that did everything right. One of the best stories in a cRPG.
Final Fantasy VI: The bad guy wins and the world is 'destroyed'. Now you're out for revenge. Great job switching characters around so there is no 'you'.
Ask me again in a week and I'll probably have a different list...