Okay, let's get one thing out of the way; the majority of this film is a character study/family drama. There are long stretches of the movie where the characters just go about their daily lives, and although it does not detract from the overall package, it does offer a better label of the films genre. Yes, there are sci-fi elements, but at its core, it is a movie about a woman's crumbling marriage, and how she deals with it.
With that said, this movie offers some excellent acting, some truly amazing and breath taking cinematography, and a great (yet subdued) soundtrack. The director also did an amazing job in framing each shot, and the movie just looks gorgeous. Hollywood could certainly learn a thing or two from these types of directors that focus on artistry over budget.
The star of the show, the Thing in the shed, was one of the freakiest things I have ever seen in any movie. It moved with purpose and grace, and the face had such a deadly intelligence as to suggest that it was smarter that the beings it was indulging. Every time it showed up on screen, I got goose bumps. Like watching the creature from The Thing mate with an Octopus. Weird, fantastical, and completely convincing. How something so genuinely creepy was created on such a small budget, I will never understand.
Overall, this is an art house drama about a woman's quiet struggles with a deteriorating marriage. Yes, there are some horrific scenes, some violence, some sex and of course, the Sci-Fi elements. But in the end, its a tale of how one woman sought solace from a failed marriage from something that was beyond her control. Highly recommended, but only if you are patient and have an appreciation of film as an art form.