I found it interesting but sort of meandering; a giant thought experiment with some intriguing characters and a good hook but that never quite gets beyond a desultory pace or energy. Despite the "bombshell" at the end, not sure I have the energy to tackle the second book.
Tag - terry pratchett
Halfway through and ready to dive in again. So far, my sense is those who are fans of both Gaiman and the genres he works in would enjoy this book the most. A lot of it is "inside baseball" on comics, fantastical fiction, etc. those who enjoy that world will get the most out of Gaiman's unique discussion and perspective on it.