Finished this book yesterday. I thought it was a pretty good story. The best rendering of the Tzenkethi that I've read thus far. It was hard for me to get my head around them in previous works, but with Brinkmanship I think McCormack did a great job fleshing out the Tzenkethi and making them understandable.
I also like how McCormack made Dr. Crusher a big part of the book. It's rare that she gets any face time so it was neat how McCormack made use of her here.
I liked the twist with the Cardassian agent on Ab-Tzenketh and how she actually chose to remain a Tzenkethi, even a reconditioned one, instead of returning to her own kind. I also like that McCormack left it murky over who set the bomb on the Venetan station.
I thought Dygan was interesting and I hope we see more of him in future works.
Overall the book had a nice flow, good pacing, and is one of the better offerings from the Typhon Pact series. It's second to David Mack's work for me. Maybe it's just something about that Aventine.