The stock SP game that NwN ships with frankly isn't that great. In that respect BG is far better.
However you should realize what NwN is really intended for. The SP game that is provided only scratches the surface.
Now for the first time (along with Morrowind) we have a CRPG that allows for players to customize their own modules for single play. The toolset allows for some very elaborate scripting and custom item creation. We can look forward to an endless supply of excellent player created games, many of which will blow Bioware's SP adventure away. Some of these modules are using the excellent Hard Core Rules package, which is really well done:
http://nwn.darkemud.com/~darke/HC/manual.htm. You can take a look at some of the mods players are coming up with at NwN Vault:
http://nwvault.ign.com/Files/modules/moduleslist2.shtml
In addition to mods, NwN makes it possible to DM a game with up to 64 players according to 3rd edition rules.
Probably the most exciting feature is that NwN also allows for persistent worlds where, by linking a large number of servers, characters can roleplay with huge numbers of other players and virtually recreate the Forgotten Realms (or whatever campaign setting you like).
Morrowind does not have a multiplayer mode, btw. Probably in future iterations of the game, but not for now.
In these respects what players will be able to do with NwN amounts to a quantum leap from BG. NwN is not at all about playing the same old single player game over and over all by yourself.
[ 07-29-2002, 03:19 PM: Message edited by: Lemernis ]