Wasn't it? That level of quality stays, too, the whole way through. There might be 3 at most mediocre books in the DS9 series. It's pretty amazing.
I'm just about to start book two!
What's really amazing, is that many events took my by surprise despite them probably being talked about in the DS9-Typhon Pact books, which I read first!
EDIT: Thrawn, with Section 31: Abyss, am I to expect an edge-of-my seat adventure, as the description sounds?