Linda Blair is excellent in this movie. Max Von Sydow has never been better. My guess is people like to be scared and this is a movie that accomplishes that. There are not many "scary" movies in the world but imo this is one of them. The demons face is downright freaky and when Blair is possessed she is amazing. She would have won the academy award but they had to use another actress for her demonic voice. Thats my take on why people watch it. And the music's great too. Why is this in the discussion for Hocus Pocus?