NWN1 was made for coop. I'm currently playing through Eye of the Beholder with some friends and quite enjoying its simplicity, i.e. there are no quests to speak of to break. Some of the really good stories can have bugs in the fan made stuff which require cautious saving (my server auto saves every 15 mins anyway....).
Check out the Hall of Fame on the Vault and take your pick. The graphics don't matter, honest!
Check out the Hall of Fame on the Vault and take your pick. The graphics don't matter, honest!