Hated the ending.
Thought it was a decent flick, good premise and some good moments. But I could not STAND the ending. Yeah the guy's accomplice was kidnapped and that's terrible. But after she helped him torture and kill these girls, and even killed some of them herself, she absolutely didn't deserve to kill the guy. That final kill belonged to one of the new girls. That one change would have let me like this movie a whole lot more.
Don't get me wrong, I understand the inherent logic behind having the protege' kill him. She's the one who's been hurt most in this, she's had to endure his torture for so many years. But the reason it didn't work for me is that it was so poorly developed. There was no gradual slope to it at all, one second she's killing girls for him and the next second all of a sudden she turns on him.
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"Pride is not the opposite of shame, but its source. True humility is the antidote to shame."