When I really sit back and think about the Swann books I've read I've got be honest.
I've been a little disappointed with his last two series, Hostile Takeover and Apotheosis. The same problem runs throughout all six books, but for me was absent in the Moreau Quartet. the characters are barely two-dimensional, and that makes them uninteresting. This includes the ones that Swann sneaks in from Hostile Takeover and Moreau books.
Sneaks in is my term. Swann has uses for these characters which is why they appear, and it can be argued that Apotheosis is the final culmination of all of his science fiction work. He discusses, in depth, his universe's heretical technologies. What David Brin called uplift, the genetic engineering of animals into sentient creatures and used and abused, AI, and human genetic engineering.
There are also discussions about God and faith, and those two are not necessarily the same. Adam sees himself as a god, but is he? What determines a person's beliefs, and is there good and evil?
Swann lets his characters, and the various larger groups, reach their own decisions.
Regardless of how much I do not want to say this, because I really liked the Moreau books that began this universe, it was a slog to the finish. Not as much as a slog as Hostile Takeover, but it was starting to become a, "I'm going to finish the damn book" read.