I don't think I've ever read a book quite like this. I think it was sometimes difficult to connect with each story and  the characters as they were only passing ships for the story of humanity as a whole. However, I still had to go on reading, and every time I read I found at least something in each story worth sticking around for. My Favourite chapters were City of Laughter, Speak fetch say I love you, Pig son, and probably a gallery a century a cry and millennium. 
This book is very sad and slightly unhinged in how it handles human sadness. I still don't know how to feel about that.

Update: I think I decided that I feel like this book deserves 5 star. I was just so deeply strange and wonderful.