I have only read the McCoy part of the Crucible series. And like I said I did enjoy it overall, it had a lot of really great moments.
But I think the ultimate conclusion for both McCoy's was really disappointing. McCoy's "problem" didn't match with my own feelings for the character. Of course that is not the author's fault. After all McCoy is in many ways a blank slate that different interpretations of his character are entirely possible.
But let's just say I was hoping for something more
with the book. However that is really only the ending. There to me is still a lot of great stuff in the book.
Now I can't speak for Spock and Kirk since I have not read those yet.