It's got a great premiss and is quite good overall, however there are certain parts of it that makes you 'not care' as it were about the protagonist. On the other hand it's nice that he isn't as 'good' as some protagonists are.

I guess I'm a bit let down because they could have done so much more with it and with how I saw the ending coming from a mile away, that said, I do that with most films.

It's a good film if you like stuff like Death Bell, Incite Mill, Death Game Park and Battle Royale, but they far outshine it.