Although you're not really asking about other games, I would highly recommend Knights of the Old Republic. It is single player, so perhaps you won't want to go through it more than once, but even that will give you more than your money's worth IMO. KOTOR pretty much finished my desire to play D2.
(I don't know if you tried ever KOTOR, but I think its combat system is very nice even though it is turn based...)
(I don't know if you tried ever KOTOR, but I think its combat system is very nice even though it is turn based...)