As to it not running without problems. I had no issues with it.
I have to ask: have you ever turned the graphical options to maximum, and have had a
lot of critters on the screen?
I even didn't finish the SP game as it got tedious, but I did enjoy several of the MP sessions I was in.
That's the whole point. I bash NWN's singleplayer gameplay, for the most part, because it is bloody godawful. The bad graphics are just an added bonus.