Planescape: Torment

The Good
The story had incredible depth, everything you do had an effect on what happens at the end of the game, and each character will actually react according to personalities. The options in conversation is the best in the business, you can lie, bluff, vow, tell the truth, and it all affects who you are. It embodies the good old RPG of rolepalying and storytelling.

The Bad
The AI pathfinding can be extremely annoying at times, where they will take the long way around the map and attract every enemy's attention, and sometimes the game locks up at specific places

The Bottom Line
If you have not gotten this game, by all means do get, the story is to die for, and the each character was developed so that s/he has a realy personality...and yes...I'll admit it...I actually shed some tears (only some) at part where you absorb your former selves. The folks over at Black Isle deserve an academy award just for the story along.