Again, I feel that the story would fare better if they were complete stories in their own right, that is, written in two books rather than halves.
The first story is more on the Marquis and Paris rather than on the Badlands itself. Nothing new is introduced. I would have loved a more detailed story of the hide and seek in the Badlands before the Voyager disappeared. I find it rather difficult to believe that Spock and Data were not able to come up with the explanation of the Badlands that Janeway could.
The explanation of the Badlands is quantum singularity. That's it. I really mean that's it. There is no further expansion on this matter to describe QS. Next Romulans are expert in QS and they can capture it. That's really stretching it. It's like capturing the whole universe. A capture went wrong and the QS is be passing through the federation. huh? I thought the Badlands is where is always is and if the QS is causing the Badlands, how can it move?
Sisko was able to use Romulan's technology and move the QS away from Federation territory. Huh? What happen to the Badlands now that the QS has disappeared or re-directed? Has it become the Goodlands?
I find this last story the weakest of all leaving so many holes and even for people like me who would like to stretch the imagination when reading scifi, I find the idea of capturing QS rather ridiculous.