This large volume (584 pages) has the kinds of strengths and weaknesses one can reasonably expect in any attempt to identify and publish "the best science fiction of the year."
While I found several gems that I REALLY enjoyed, there were a few duds, too, which simply failed to spark any interest or response in me at all. Now I don't automatically assume that this is the fault of the author, since the genre of science fiction is especially sensitive to one's tastes, I think.
Most of the stories, all told, ranged from OK and somewhat interesting to ALL RIGHT NOW, THIS IS A WORTHY DIFFERENCE!
One of the decided upsides of this kind of book is that you get exposed to many people you likely never heard of before, and there are a few of the authors I have "bookmarked" to track their more substantive novellas and novels.