Lol, i agree there, NWN's single player campaign was horrible. Heck even the "hardcore" NWN fans will probably tell you they never finished it. I only bought it for the Editor. It's amazing what you can create yourself though, even though the Bioware team didn't seem to have the ability to demonstrate what you can do with the editor via the single player campaign. Heck you can probably recreate any other game with custom skills/spells if you want, although i agree Dungeon Siege had a much much better engine, even though i hated the actual gameplay.
Either way i'm willing to go as far as saying NWN is more a "software package" than a game if you got some coding skills. They probably would have done better than to sell it that way and said "oh, just for fun, here's a campaign created with the package". Actually i think that's what it amounted to anyway :P Should've called it "Bioware RPG Creator v1".