I watched this film without hearing anything about the film apart from what i read on the box and was just really impressed by the level of tension the film generates.
The film is about a security guard who is obsessed with his wifes murder, this is not your Hollywood thriller with a 'hero' out for revenge, he just wants to know why it happened.
The characters in the film feel real, and the whole thing reminds me a little of 'Fargo', in style rather than plot. The spooky hotel shots also reminded me a little of the Shining, though this is not a supernatural thriller by any means.
Its the level of tension that makes the film really work, its edge of your seat stuff throughout. I've seen to many movies lately that fail to achieve that and this a refreshing change from the big budget nonsense palmed off on us as 'thrillers' these days.