I'm not sure where the two previous bad reviews are coming from.
This film has won 10 international awards and even Lloyd Kaufman himself loved it so it gets my vote anyway!
In a nutshell, although not to demean from the main story itself this is basically "What is Buffy The Demon Slayer happened in Ireland?"
Personally I think it's a fantastic take on everything. The acting (save from one of the primary cast members IMHO) is excellent, the story is nice and well rounded and I'm not sure why the other previous reviews are talking about the VFX because they look good to me.
Are they 10 Million Dollar horror scifi budget level? Well of course not... this film is an indie flick so what more do you expect?
I think for what it is, the market it's going for and the actual story itself the film achieves exactly what it set out to do!
Personally I can't wait to see the sequel. :-)
Ohh... and that's coming from someone who isn't usually a fan of horror movies either.