There is really no surprise in this category. The Exorcist may be the only film in a genre that really just destroys the rest of the competition. The film was masterfully directed and had an amazing cast of actors. It had groundbreaking effects and became arguably the most famous horror film in the history of cinema. No other film in any other genre carries such a dominating presence within the genre. I don’t know if this is because other exorcism movies are so bad, or I just see them all as bad because they can’t compare to this film. The bottom line is that no other horror film can claim to have as much success, mainstream or otherwise, as this film. It is, by far, the most important horror film ever made.