OK, maybe I am a little biased, because I am from Austria (hello Rainhard Fendrich...), but I don't get the negative reviews. So I would like to raise the attention to an overlooked point.
This is a horror comedy and I fear that either the dubbed version lost a lot of the funny moments or maybe the sense of this typical Austrians humor wasn't broad enough.
E.g. the drinking scene with the Russian investor: If you know a little bit about the country's history AND the actual consumption of alcohol it is perfectly set up.
So if you don't get the laughs it leaves you with a very simple story and solid handmade SFXs.
For me it's the perfect mix of humor, gore, fun and nice ideas.
I hope for more genre movies (action, thrillers, horror) made in Austria.