Horror movies that focus on gore and killing aren't real horror movies.
Those that focus on abject terror, the ones that cause you to squirm on your seat, that causes your own mind as the audience to become as frightened and terrorized as the victim on screen, are the true horror films.
It's not enough that someone dies. It's so much more when you see the person in there having to make desperate choices and watch as your hatred for the perpetrator grows even more. Sure, there needs to be some gore, but it doesn't drive the movie.