yeah, I can see how the acting sucks - but then again it's a horror film - I pretty much expect the acting to suck off the bat. I'm looking for gore and basically original ways to kill people.
You can't tell me that scene with the dresser drawer wasn't cool and the whole concept of a homicidal plumber in a 'death van' wasn't cool.
the twist, I figure is to explain the series of sequels that will inevitably follow.
if you want story, Hostel is better - if you're looking for a pure horror film then I gotta go High Tension.