I'm a librarian who loves anime, manga, and reading a wide variety of genres.
One thing this book is doing, and I'm not sure yet if this is intentional, is making the Paratwa more sympathetic. Yes, there are six or seven thousand deadly Paratwa assassins, but there are tens of thousands of Paratwa total. Most of them live relatively ordinary lives. Meanwhile, Nick and Bel don't seem to make a distinction - they think the Paratwa should be wiped out, all of them. Even the Paratwa assassins have shades of gray in this book. The current scene is introducing a Paratwa assassin's human wife, and they seem to have a loving relationship.
Man, anyone who reads the trilogy after this book is going to have some serious whiplash. Maybe I missed it or forgot it, but I don't recall there being any mention of the Paratwa being anything other than ruthless killers (and, in a few memorable cases, rapists), even in the scenes that were focused solely on them.