Planescape: Torment is my favorite game of all times. The most positive gaming experience. Hour-long dialogs, the setting. It's like a good well-written interactive book. It has it's own flaws, but you forget and forgive them because of excellent story, writing and setting. In the most of RPG games you can kinda predict what to expect from this or that interaction. In Planescape: Torment you can't. That's the best part. Each dialog, each interactions with some random object is so surprising and rewarding.