Ils... I preferred it over Eden Lake. One of my favorite films of last year. And if you're looking for a really fucked-up intense slasher movie, I
highly recommend
Inside.
There's also
Timber Falls. I wasn't a huge fan, but it's similar to Eden Lake, which I wasn't much a fan of either... So if you like one, you might like the other...
Same goes for
Frontière(s).
Actually, come to think of it, the plot does get a little ridiculous with the last two, but people seem to really like Frontière(s) around here.