Definitley one of the better Star wars games.
The graphics aren't the greatest, although there are some scenes that will impress you. The sound is excellent, the lightsabers for example sound very realistic.
Overall Knights of the Old Republic has good graphics, excellent sound and great gameplay.You cannot choose the difficulty but it is not very hard and if you stick to the main quest it should take you ten hours. But there at least one hundred other quests out there waiting for you. Lastly, there is a cool light side or dark side system where if you do something mean you gain dark side points. But if you something morally good, you get light side points.