This adds a tremendous amount of rich textual depth to the game. Nothing beats text for firing up the imagination. Character's are not flat genetic types in general. Descriptions which are dark, desperate and sad are common. And, you certainly won't find your usual skeletons and rats in Planescape .
Skeletons are civilized, and rats are some of the most potent adversaries in the game.
Everything is twisted, turned-around. If you're not into reading quite a lot of text, then play a character with low intelligence. Conversation trees are long, intriguing, and mysterious. The best part of Planescape is the suspense and how well paced the story elements are. The mystery holds long into the game, and reaches an amazing climax which drops into an almost not to be believed ending.