The thing about scary stories, in my opinion, is the impact they have on you. For it to be worthwhile, it must tease, shock, and shatter, in a matter of moments.
There are some fantastic short stories in here that are worth mentioning, for the reasons I gave above. They are short and precise, going straight to the heart of the matter, leaving you a little nervous to turn off the light.
The Shadow by E. Nesbit:
You must have noticed that all the real ghost stories you have ever come close to, are like this in all these respects - no explanation, no logical coherence. Here is the story.
The Tarn by Hugh Walpole:
As Foster moved unconsciously across the room, bent towards the bookcase and stood leaning forward a little, choosing now one book, now another with his eye, his host, seeing the muscles of the back of his thin, scraggy neck stand out above his low flannel collar, thought of the ease with which he could squeeze that throat, and the pleasure, the triumphant, lustful pleasure, that such an action would give him.
And there are other stories that do not fit the bill. They are meandering, and slow to scare.
All in all, it's a mixed bag, but that's what you'd expect from a collection of stories.