Gameguru Mania has written up their own review of Neverwinter Nights 2, handing the RPG sequel an overall score of 81%.
Overall, I would say Neverwinter Nights 2 is definitely worth its cost. It looks to make advances in all of the same areas as the original - strong single player content, solid multiplayer experience, excellent toolkit and support for all aspects of the user community. There are a lot of frustrating bugs and issues still in the game (do save very often if you play the game, the quick save is there for a reason), but the latest patch has significantly improved performance and fixed many bugs. I would definitely recommend this game for fans of this genre.