Designing and developing massively multiplayer (MMP) games are very difficult endeavors that often require large teams and time/money investments. This book provides useful knowledge that can help identify and avoid potential development pitfalls.
The articles in this book are separated into three sections - design, engineering, and production techniques. Therefore, it isn't just for programmers - numerous development team members will find value in the book's articles. I think it's important for developers to read most or all of the articles - even those that aren't specifically intended for their position. This practice can increase understanding and communication between the members of interdisciplinary teams.
In each article, a member of the MMP development community explains his or her experience with a particular topic - telling stories in online games, automated testing, anti-cheat mechanisms, etc. While some of the technical essays supply pseudocode, most articles present examples from existing games and other ideas. Don't expect to build an MMP engine or even detailed designs based solely on the information in this book. Instead, these articles will provide insight and advice on many issues you will encounter as you plan and develop an MMP project.
Some of the essays feel a bit "thin", and the authors don't seem to sufficiently explain their topic. In some instances, the topics are simply too complex to fully examine in one or two articles. Nonetheless, the subjects in this book are important for developers to consider. For readers that want to delve deeper into a topic, most articles provide references to related information.
This book is intended for "intermediate/advanced" game developers (specifically those in the MMP industry), and my rating is based on that audience. For those unfamiliar with MMP games and/or software development, it will be difficult to appreciate the articles in this book.