Game Shark has a review of NWN 2: Mask of the Betrayer available for weekend reading (thanks to NW Vault for the head's up!). Grading the game with a "B" rating, the reviewer said:
Multiplayer is a huge part of the game and it succeeds in a big way, especially if you have a regular group that you can play with over as LAN. Playing the campaign in co-op mode is an absolute blast. It's way too early to do any sort of real critique of the powerful mod tools and editor that comes with the game but the community is hard at work making new adventures, so we'll have to wait and see how that all pans out.
Neverwinter Nights 2, technical issues aside, is a fun ride that is sure to please old-school RPG fans who want to play a classic party-based adventure. It's still a patch or two away from being all that it can be, but with party-based RPGs being so few and far between these days, it's definitely worth playing.
Good review and worth the time to read. Enjoy!