Overrated. The near lack of dimensional characterization-- apart from too-easy character background and broad details- hamper the horror scenes, that are too glossy in direction, making the scares sanitized, and the jokes cute, but not funny. It simply needed a longer runtime or needed to know what it wanted to be. 2 years later, You're Next, balanced the precocious blend of horror and satirical comedy better.
This was completely unexpected. Australian horror does it again. Almost masterful pacing, sick, twisted, insanely good tension, great soundtrack through and through. I haven't rooted for a protagonist this much in a long time. The goth girl suplot is genius in its both relief of tension and subversion of how (bad) horror movies put all the focus on the main action. Just really good. And in only 80 minutes? Wow.