If you're into space politics, and lot of different species of aliens then I would recommend this book.

I wish I had some small illustrations for what the main alien races looked like. I don't know if it was all the info dumping during the first half, but I had a hard time telling them apart and picturing them.

I do like how this small group of humans who rock the political landscape of these alien species are from the sanitation unit. That makes this story feel unique and interesting. They each use various aspects of their job to solve their problems. I thought that was cool.

Sadly, I do not feel interested in continuing this series for the moment.