I don't much care for horror films as a rule. But I wouldn't have said the novel was a 'horror' storry just a simple ghost story. Went to see it on Saturday and was v disappointed. No need for all the extra bits added to the story. No need for all the scary effects. It's scary enough with everything simply suggested.
But maybe it was never going to work as a film without the added ghoulishness. Shame really. Less is definitely more.