Lambach
Arcane
To those that "know", as in, those that use NWN for its intended purpose - a game engine where u can download other user's adventures and play through them - NWN is probably one of the most amazing CRPGs ever. That is because there is a wealth, and I mean a WEALTH of user modules that range from good to extraordinary that one can play with a very sound engine and ruleset in NWN. Hope that helps!
Download whatever you want, there is no salvaging a game based on D&D 3.0 in which you can't control a full party. Imagine playing a non-caster class and having dozens of hours worth of gameplay consist of left-clicking stuff and watching passively as they die, only occasionally opening your inventory to pop a potion.