GameSpot has posted their review of the Neverwinter Nights 2 expansion, Mask of the Betryayer. Overall the expansion looks very good, and should be worth the purchase.

From the article:
‘Mask of the Betrayer is a much more mature expansion, both due to its content and because it demonstrates how Obsidian Entertainment is maturing as a developer. If you felt that NWN2 was a bit too action-focused, then you should definitely check out Mask of the Betrayer’s blend of combat, puzzles, and decision-making.’