Well, I used to be pretty scared of Goosebumps as a child. When I read the books now, though, I find them very predictable and funny, and the spook factor is gone. I hear Fear Street is more frightening, and it should be a Young Adult book too, shouldn't it? In any case, I think there shouldn't be a restriction on horror. The EverWorld series is YA and pretty dark and violent at the same time. It depends on how much individual kids are willing to take.