Well, I've finally finished the original campaign. Unfortunately, there were quite a few bugs when this was released which were a bit of a pain - thankfully they released patches pretty quickly, but these definitely took away from the overall *goodness* of the game.
For those who want more modules to play, I've found that Neverwinter Vault has a pretty good selection of user created ones:
http://nwvault.ign.com/index2.shtml
I give this game 8 out of 10, once the bugs were fixed (especially the screen refresh issues in the original game - almost unplayable, even with a decent machine). I'm pretty much only play single player, as I can't be online consistently to do it any other way, so this is really a single player rating.
edit: I played a wizard - bloody hard to start with, but bloody cool once you can start flinging all kinds of nastiness at the baddies