This could very easily have degenerated into a cookiecutter DS9 story; all the standard elements were there: Bajoran terrorists from Kira's past, treacherous Cardassians, a threat to the existence of the station and the future of Bajor, scheming, greedy Ferrengi, and an overworked Sisko regretting that he hasn't time to spend with his son. There were a couple of new twists, such as a sympathetic look at a Cardassian, and we were missing the requisite appearance by the Prophets, but for the most part, there was nothing really new here.
Still, the writing was good enough to overcome that, at least for the most part. The story was a good read in spite of itself, and the characters were mostly well-handled, although Odo seemed a bit more cardboard than usual.
If you're looking for a novel and different DS9 plot, don't look for it here. But if you're looking for a competently executed rehashing of all the standard elements that make DS9 what it is, this is a fine example of the genre.