The Exorcist is a great horror movie. I don't think that any movie can be classified as the scariest. Any movie you can think of, can be countered by another movie. It all depends on who you are talking to. True Exorcist(the new version) is very scary. The sequels sucked by the way. Sleepaway Camp was great, and I was totally shocked at the ending. Indeed very disturbing. But couldn't you also argue that May was disturbing with the video scene? My personnall favorite is Halloween. Not so much for the acting, but simply because I thought that it was a good straight forward scary movie.
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