"Repulsion" is a great example of how to make a truly scary movie: The trick is not to fill the screen with monsters or indestructible serial killers, it is to portray fear in a way that will be familiar to the audience. It is clear from early on in the film that the lead character, Carol, played brilliantly by an extremely young-looking Catherine Deneuve, is not exactly normal. When her sister leaves her alone in their shared London apartment for a few days, however, the things that scare Carol are the sorts of things that have scared a lot of people spending the night alone, such as hearing (imagined) footsteps in the hallway and the like. Of course, while normal people get a brief fright from such a thing, Carol descends into a madness of hallucinations. The movie is seen almost entirely from her point of view, using techniques borrowed by later directors such as Darren Aronofsky for his movie, "Pi", which gives the entire movie a claustrophobic feeling that enhances the impact of Carol's hallucinations.
There are no doubt people who would like to explicate this film as an exploration of sexual repression or the like, and perhaps they are indeed hitting the mark in doing so, but this film works brilliantly as pure cinema, with no metaphoric subtext needed.
Overall Rating: 4 stars (out of 4), or 9 (out of 10)