I was fourteen years old when this film was released, and it was really a shocker for its time. Although I can see the points raised by detractors of this film, nevertheless, it is, in my opinion, one of the most truly terrifying movies I have ever seen. The scenes in which first Ralphie and then Danny Glick appear in windows at night, scratching to be let in, were utterly horrifying, as were the scenes with Mike Ryerson in Jason Burke's guest bedroom ("Looooook at me ... I will see you sleep like the dead, teacher") and Marjorie Glick in the mortuary. Along with the original "Halloween," this is a film that really, really scared me, and I feel that a key element was the lack of gore (which is probably a disappointment to younger viewers used to explicit splatter). The nonverbal dialogue of expressions and actions, the music, and the significantly occurring silences resulted in the suspense which makes a film truly frightening in my opinion.
Having said this, I do feel that the book was much, much better than the movie, and I would recommend it as one of the best vampire stories ever written (sorry, Anne Rice, but it's true). But let's be fair and realistic. It's a rare film that excels the book on which it was based. Not one of Stephen King's wonderfully (and horribly) imaginative works has EVER been committed to film in a way that has equaled the written work. Never, ever, EVER. That is something that will just never happen. If it were possible, then nobody would bother to read his books, he would become a screenwriter, and that would be a real loss for the horror genre.
