I've cut the McCarthy disc down to about 52 minutes and find it a much more satisfying listen. It's weighted more heavily on the quieter, emotional cues, with just a few of the better action tracks to balance things out.
Specifically, I retain tracks: 2-6, 8, 10, 12-19, 21, 23.
The Thaxton interview pretty much states that some of these cues were chosen more because of their place in DS9 history as opposed to their musical value. Hence, we get a few cues from the Mirror Universe episodes because they're "cool." Neither the "Crossover" or "Shattered Mirror" cues are particularly riveting and could have been swapped out for something more engaging from later in the series when McCarthy's action music was allowed to be a bit more dynamic.