And it works - As soon as you’re comfortable with the interface, the game turns itself into a big, original Dungeons and Dragons experience. The personality of other characters are limited only by their players and instead of a set number of possibilities and results you would expect in any other digital RPG, Arelith provides the most realistic social experience you could expect from a fantasy video game. And just as a reminder, Neverwinter Nights is a 2002 game, with squary graphics and a non-updated DnD system and that doesn’t seems to be a problem at all.
The quote above is from an interesting, recent article on a Gamasutra blog about the Neverwinter Nights Persistent World called Arelith (which is one of my favorite NWN persistent worlds/shards too).