It's no definitive masterpiece but it's damn close.

A lot of perfectly good film show their cards early, establish a unique premise and let the audience explore a topic at a leisurely pace, without much in terms of surprise. this film is not one of those films.

The film never slows down or bores, plunging from one harrowing sequence to the next.

One of the worst ways to make a cult movie is to set out to make a cult movie.