The wife character, played by Sissy Spacek, is not only superbly-developed, but also desirable as fuck. Not only that, but it's a wonderful performance. The father character is however given the movie's best character development, as well as its best performance. One other great performance is that of the bubbly guy from the US military.
The director offers an exhilarating and well-written investigative thriller, much like his earlier Z (1969), a more intense work, though lesser overall. The subject matter is grim and the imagery horrific. The filmstock is of shitty quality sadly, perhaps a deliberate decision, to help make viewers feel unease.