The two lead actresses are okay. I give them a six out of ten for acting skills, but they get a ten out of ten for being gorgeous, which is pretty much mandatory in a horror movie. Both characters build a decent story for themselves which certainly helps the movie progress. Supporting actors don't provide much for story development, with the exception of the youngest brother. His acting/character is actually the best of all of them, in my opinion.
Camera work, lighting and sound are all okay, except for a couple parts in the slaughterhouse, when the lighting could've been a little better. Scenery doesn't offer much to look at, but there aren't any wide shots of the land, either. All of the shots are done on the farm property, in the city or in a building somewhere. There are some errors in continuity, but they aren't bad enough to interrupt the story development.
All in all, it's not a waste of time to watch this movie, but it won't be the best one you've ever seen.