À l'intérieur 2007 french horror movie review

There are some movies on imdb that I don't understand why they have high ratings. This is one of them. It is a pretty good movie. But there are a lot of films that are much better than this but have much lower ratings just because people always give horror movies lower ratings for some reason. Was it because it has a pregnant woman as a protagonist? Is that why? There are much better foreign horror films that I will probably do a series on.