Im surprised that no one mentioned this...
Fallout, and Fallout 2. The best games ever made for the PC, and the most recent one is 5 years old. That is saying alot, and this comes from a man who has played a many CRPG.
The game is set in a post apocalyptic world, and is a bit slow on the start...But man, do they rock. Brilliant game. Very open ended.
I cannot say enough good things about it.
