The Beginner's Guide to Zen Buddhism is both fantastic and flawed. It is a valuable resource for beginners in establishing a basic mediation method, understanding the basic structure of Zen practice, and learning, albeit briefly, some of the history of Zen.
This book's brevity is also part of its flaws. Short books is the norm for Zen studies, but this book claims to be a beginner's guide while glossing over much of the actual cognitive aspects of Zen. Couple this with the book's age, and it's value slips a bit from being the perfect primer it aims to be (the title is THE Beginner's Guide... after all). The age is a problem when it comes to resources. There is a decent list of suggested readings in the first appendix, but the second lists Zen centers, mostly in the U.S. I don't know how many of the groups are still in practice, but the one listed for my city is a relic. In fact, a quick internet search revealed more active groups (likely splinters of the original listed in this book) active in my community. So the appendices are useless in the Internet age.
The emphasis on groups raises my next point of contention. While it might be useful to know what to expect when entering a zendo, the emphasis on formalized teaching and group meditation presupposes two problems: first, that readers are so interested in zen as to seek out local groups to practice with; and two, that practitioners need group practice.
One of the key teachings is that there are nearly infinite paths to enlightenment. The presupposition that followers need to practice in ritualized groups might hold for some, even many, believers, but risks turning off others who might mistake this emphasis as a requirement. The author makes perfunctory attempts to clarify that group practice is not a requisite, but then goes on to extoll the virtues and group practice and even at one point claim that one needs a teacher before one can actually surpass a certain point. While I concede that is probably true for most people, it can possibly turn off the few who wouldn't.
This may seem like I'm laboring a point that even I don't feel is completely bad, but it typifies the problem with this book. It makes an attempt to disclaim itself as a be-all source of Zen education, but it puts far to much emphasis on minor points of practice without explaining some of the finer, more important aspects in detail. With that said, it works as a resource for beginners with a couple other books as backup, so it's worth the read. Just don't put too much stock in the advice it gives that you don't find in other books as well.