The good:
Kilmer pulls off a fairly believable psychopath, and there are some really great performances from those in the steam room, although they sometimes border on the "over-dramatic" rather than "convincing".
The music is not bad too, always reflective of the mood without becoming too invasive to the action on screen.
The bad:
Firstly, some of the scenes are quite drawn out with no sense of progression. Some of the steam room scenes are difficult to stick with, in particular one excessively long scene towards the end of the film. During this scene I looked at my watch to see how long was left on the viewing time - not a good sign if I was meant to be engrossed in the story.
Secondly, the method which the story unfolds seems fairly underwhelming. It felt as though there was more potential for the plot to thicken, particularly from those in the steam room. The captives also seem to have their own designated "turn" at falling apart/going mad, which is overall quite unconvincing and ultimately predictable.
So in conclusion, there are some good scenes, but this is not a film I will actively recommend to friends.