Finally got to read it, rated it Above Average.
Just from skimming over the comments here, I see that almost everyone's complaint is the same... we want more! I feel like any chapter in this book could be expanded on in a full novel by itself. Maybe some of them will be some day.
That didn't really bother me per se,
since I knew going into it that this was a book that was going to cover what two more trade paperbacks had originally intended to cover. It was wonderful seeing so many points come together. And I was surprised that this book went all the way up to the founding of the Federation; it's a much more satisfying ending than the TV series got.