I finally pushed myself to finish this book and I feel that reviewing it would not do it justice. Jennifer R. Pournelle really thought this story through, from places and history to biological adaptations and imperial politics, from religion (complete with hymns lyrics and music) to fully fleshed out characters of both genders (so to speak). So when I say that Outies carries out the tradition started by Larry Niven and her father, that's high praise. But did I like the book? That's a no.
Just like the two books before it, the main character is not really some person or group, but rather the universe of humans and moties taken as a whole. Just like them it is very cerebral, with many facts, discussions, negotiations and considerations. And just like them it is slow as hell and people just come and go and you never know what and who to connect to.
This sometimes works for me. I adored the Malazan Book of the Fallen series, which was kind of the same in terms of avoiding focusing on any one characters for too long, but those books had a rhythm that you could fall into. Outies, on the other hand, feels written more recently, but its pace is all over the place. And it was a very stressful period for me, too, so again, maybe I am not the best person to review this book right now.
Bottom line: if you liked the other two books in the Moties series, this is a good continuation. Personally I had to really really push myself to finish it and I almost abandoned reading it a few times.