Most of the story was good...the ending was rather lacluster. And given how the successor novels play out I think that the ending could have been viably darker. What I mean is that for a novel trilogy billed as shaking up the Trek(novel)Verse it concluded in a "typical" fashion (Hero's are happy, and there's much rejoicing) and the Borg are resolved with the same tact as V'Ger (merging with the Caeliar to become something 'bright shiny and wonderful.')
It might just be me, but I think that Spoiler
would've had greater potential for character development and stories in the Titan series instead of Spoiler
And at the end Picard being chipper can be just didn't feel right, I could get elation and relief at the Borg's demise, but the novel portrays it in such an over the top fashion that you'd swear the Borg must have been plaguing Picard since before Encounter at Farpoint.
I think that the Caeliar's much touted isolationism and pacifism should've been played up and they don't intervene...until Picard goes axe crazy with WMD's (in most of the trilogy Picard BSOD's and is on the verge of a total breakdown, so it's not an unreasonable scenario.) And the Caeliar abhorred by the "obscene violence" intercede to save the Borg not just from themselves but from Picard as well.
Top it all of with Picard having to regret his actions, having to work through a resulting depression, and the medal he receives being a metaphoric ball and chain and a constant reminder to him of his crimes and how he flagrantly violated his principles out of personal instincts he had assumed he himself and humanity as a whole had long evolved past. Dash in a schism in the crew (loss of respect from Geordi) and the Pandora's Box of unleashing WMD's to the post Borg Alpha/Beta Quadrants and I'd think the Typhon Pact arc would be far more interesting.
I don't have a vendetta against the characters, I just think that the Trekverse could use a bit more reality (that actions have consequences that stick, and that our hero's aren't infallible demigods whom are cured of all their flaws by genuine demigods.) The trilogy ended on a happy note which is inappropriate given what all was lost, the tens of billions dead, the decimated military's, and the scores of destroyed worlds. And For something meant to 'shake things up' it did it in an underwhelming fashion (half way through the first book I saw the ending a Parsec away, which is "reality" for Trek.)