Planescape Torment, for me, is sort of like the Citizen Kane of computer games. It was well thought out and beautifully envisioned story that was like nothing I'd ever seen when it was released. I'm speaking about the plot, mostly, the story, the setting, and the characters. Planescape accomplished something in a PC game that made it a piece of classic literature in my mind. It fused what could have been a fantastic novel with a game engine, and it did it in such a way that if it had been written in a novel or cinematic format, it really wouldn't have had the same effect. It took a standard game format and, where anyone else would have tacked on a story to power the game, it used the game to power the story, and it did a damn good job at it. It did for CRPGs what Watchmen did for comic books. To this day my original Planescape Torment box holds a space on my classic literature shelf between hardback copies of Huckleberry Finn and War and Peace. It's the only PC game I own to ever achieve this honor.
The original game did not leave any place for a sequel, but I would very much like to see another game in a similar setting. I have to admit that the classic elves and orcs setting, or any of its various clones, has long gotten stale for me.