KotOR doesn't have multiplayer, but it is excellent single-player RPG nevertheless. Howewer, you must become a jedi and if that does not bother you, then this game is definitely a good choice.
Only thing that's annoying in KotOR is interface in PC version, it does it's job pretty well in everything else except weapons change. It's just getting on my nerves if I have to change weapons and then scroll down a mile long list, then scroll back half a mile because I apparently missed the weapon I was looking for. I hope Bioware improves PC version interface in the upcoming patches, other than that, no gripes.
I've already lost count on how many times I have finished the game... Hmh, bad sign...