Really enjoyed it up until the 'twist'... *spoilers*
So, Rose goes from being the one we all hoped would be retain her innocence to literally being the worst of the lot, along with the same cold, robotic mannerism that would make Michael Myers proud. I really wish they didn't go down that predictable route.
It ruined the whole ending for me. The suspense and creep factor was 10/10 up until that point, then it just felt like your run of the mill ending you'd expect from a mediocore slasher film.