Getting into the Planescape: Torment territory...
THE STORY
"Mask of the Betrayer" is a very rich, dark, and involved game in which you really have to pay attention to what's going on to follow the story - it's a basic anmensia, "who am I" story, but still very well done. The team at Obsidian has done a terrific job of providing and excellent new (and weird) world with a tremendous number of rich sub-environments.
You of course get a several companions to accompany you through the world of "Rasheman". Although your companions can be a little irritating at times, they're also unique and *interesting*. I remember being sort of thrilled running through the dialog options with all of the Planescape: Torment characters and I'd say the "Mask" characters are just about as much fun. They are also involved the story, so they more than just window dressing.
The dialog and voice acting were both terrific and really add to the atmosphere - all of it very professionally done. I also thought the background music was terrific.
The bad - well, the camera kind of sucks - I tried both strategic and character and found both a bit clunky. Although I understood the purpose of the spirit meter, I thought it was more irritating that fun. The story is *highly* linear and it might have been fun to have more optional side quests and areas. There were also a couple areas where it seemed monsters were kind of thrown in well.. just to have more monsters. Might have been more interesting to have them in separate areas.
This is a STORY driven expansion, so if you are looking for hack & slash, forget it - your probably going to get bored. If you like dark , rich, intelligent stories, then this is an excellent buy.
I compare *all* RPG games against Planescape: Torment, and well, this comes pretty darn close!