This is primarily a "blood and gore" novel, with very little 'science', and little to enhance the characterizations of any of the Deep Space Nine regulars.
I read Star Trek and Star Wars books in a day ... two at most. This one took me three weeks(!) to plod through, in the vain hope that I would find something to justify my time ... but found nothing at all.
If the reader enjoys Gothic plots regardless of the impossibilities presented, the reader will strongly disagree with my valuation. If the reader is more in line with Gene Roddenberry's Star Trek, s/he should give this one a 'pass'.