I generally stay away from short stories, not to mention fairy tales, and this is essentially a collection of short stories that are at least in part inspired by well-known fairy tales. That said, while I can't give it a higher rating, I must stress that it has some great moments and overall it proved to be a pretty good read, even though I wished for one coherent story and a much better and more detailed description of the world in which the action takes place.
Do have to wonder how did it take somebody such a long time to make a game inspired by this, because it's excellent material for that. The author lists the ingredients for potions and their effects, places and conditions where some of them grow, all sorts of monster types and the abilities of some of them, the Signs used by witchers, their more unusual physical abilities... The scope is narrow, but the amount of detail offered within the confines of said scope is significantly beyond what could be expected from this format.