For a thriller written by a politician, it's actually pretty good. As a thriller overall, it's pretty average. The storytelling is mostly flat and there's too much focus on the plot moving forward through meetings and other bureaucratic events vs. actual action. I understand that Cohen as a bureaucrat wrote what he knew, but it often doesn't make for interesting reading. Also, he's not at all good at building suspense until the last 30 pages or so: generally, every time there's a plot twist that could move the plot forward in the long term, he instead resolves it anticlimactically in the next 10 pages. Cohen's decision to set the events in the then-present, including usage of actual historical names in the recent past, also means that much of this book breaks the fourth wall in ways that are just weird. The most noteworthy example of this is having his fictional president and that president's fictional cabinet succeed President Bill Clinton and frequently refer to Clinton's actual cabinet and actual events that happened during his administration. This often gets awkward, and while Cohen at least avoided imploding his own universe by mentioning his own service as Clinton's secretary of defense, the framing is often oddly off-putting. Maybe this was Cohen's way of getting around writing what he knew without leaking classified information and it might even have been the best way to do that, but it's a very cumbersome device that distracts from the narrative.
With that said, this book does hint at some some interesting factual details about the way the US government operates, and the story is overall adequate and fairly realistic, if for the most part not terribly thrilling. I can see why the back jacket has a variety of kudos from professional thriller writers and professional politicians, because this book as a reading experience falls squarely between them, neither one thing nor the other.
Check it out of the library if you like political thrillers, but I wouldn't go out of my way to hunt for it unless you really want Cohen's (factual) insider's insight, or you simply have to read every political thriller ever written.