The Tower and The Hive (1999) by Anne McCaffrey wraps up her tower series with the same overly fluffed prose as her other four novels. The space fleets investigate Hive worlds, come to conclusions, and work out a solution to their problems so that they can live happily ever after. That's pretty much what you'd expect out of a final book.
Sharing all the flaws of the previous tower books, this book holds no surprises or revelations, softballing the pertinent moral and ethical questions, while jumping to the socially acceptable answer. As always, any antagonist or opposer is demonstrated as having bad behavior problems and issues, rather than actually issuing opinions of merit.
For example, The Rowan's family dominates the Towers. While it's true that there's more supply than demand, this doesn't dismiss the underlying concern that there's too much power in one family's hands. Even if the accuser is jealous and xenophobic, and pouty to book, to dismiss the concern so quickly is patronizing. I don't expect the finest intellectual rigor on my McCaffrey SF, but I do demand some rigor. Answer the hard questions, or at least wrestle with them in a meaningful fashion that respects the reader.
While at one time I enjoyed books where the good guys agreed with each other, and they overcame the bad guys, now I find such writing as too pat. Conflicts are not binaries. While McCaffrey sort of gets that dynamic with the hive, as she comes to understand that genocide is genocide, she fails to apply the same consideration to human beings. The good guys need to actually work through their ethics instead of yakking away with character building scenes, and the bad guys need to present their case in a compelling manner so that they know that they've been thinking and that they're willing to ask the hard questions.
I think that this series ultimately misses for me because McCaffrey fails to build the characters, the world, and the issues, which is a stunningly failure considering that this is an SF series.