Neverwinter Nights 2: NWN 2: Mask of the Betrayer Review at Gamespot

Gamespot has posted its review of NWN 2: Mask of the Betrayer. The review scores MotB at 8.0/10.00 with the qualifier that it's "GREAT":

Mask of the Betrayer brings a lot of exciting new things to Neverwinter Nights. First off, there are new races in the form of the elemental genasi and wood elves, as well as new character and prestige classes. If you want to play the original NWN2 with these new races and classes, you can. The setting of spirit-infested Rashemen is a refreshing change of pace from the Sword Coast, which has been the subject of countless D&D games. Rashemen makes for a much more haunted setting, particularly when you take into account the shadow plane, an alternate mirror dimension that feels as if you're trapped in a nightmare. Mask of the Betrayer introduces some cool new characters and companions, and even more intriguingly, the companions you have access to depend on key decisions you make throughout the game. For instance, if you spare the spirit of a bear god during a pivotal battle, he'll accompany you on your travels and open up quests that you would have otherwise not had access to. These decisions basically fall in good and evil categories, so there's not a lot of moral gray area in the game.

And from the conclusion:

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. As it is, Mask of the Betrayer offers up a rich role-playing experience for fans of the genre.