This is probably my favorite horror movie. Blasphemy, I know, but this has everything that I want: the pacing is off-putting, the Big Bad gets an explanation (though that's only been a problem in more recent years), awesome practical special effects, part of a Carpenters song, Happy Gilmore's grandmother... It's got everything!
The only thing I don't care for is the woman. She's poorly written, so I can't really criticize her performance.
Also, the theme is one of the best songs written for a movie ever (with the obvious exception of Ninja Rap from Teenage Mutant Ninja Turtles II: The Secret of the Ooze).