I was enjoying the twists and turns of this film, especially as the "cast" slowly discovers why they are really there, who's in on it, etc. But without giving anything away, by the end of the movie, the atmosphere is SO oppressive, and the chance for hope for the remaining characters becomes nonexistent, that it really made me depressed to a point that I came away with a sour view of the film.

The audio commentary by the culprits in character was chilling, though.

DOCTOR 13