This review may contain spoilers. I can handle the truth.
It's not clever, also not particularly good. I almost gave up when there were TWO killers, to be honest is just written to have a buncha not so smart twists.
I honest to god can't see where all the scorn for this movie comes from... the atmosphere is great, the story is a bit clichéd but there's some kind of visceral hate towards this movie that's far from well deserved.
It's a decent enough flick with some great cinematography and atmospherics... shaddup!