The Replay value for this game is quite high. You have three different classes that play very differently. The game also adapts to if you are playing male or female, which changes how you interact with your companions. On top of all that, there are choices you make during the game that drastically alter the story and its outcome. You also have different weapons and can run the game with different companions. The companions you use do have a real impact on the game and how it plays.
KOTOR also introduced the card game of Pazaak, which is rather fun; However, the computer has those matches rigged against you for a while until you develop a better deck.
Replay value 9/10