The purpose of the book is to be a comprehensive guide to training distance runners. If you are serious about your efforts in fulfilling your potential as a runner you will need to address all aspects of training. For some that may mean having a scientific fundamental understanding of how the body responds to training. I'm sorry that some of the reviewers may not appreciate the first 4 chapters of the book, which focuses on the physiology of running. Running, like any athletic activity, is about training the body's energy systems. Racing 100 meter requires a different energy system than racing a marathon. Thus training for 800 meters is different than training for 5000 meters. That is why in BTDR you get basic physiology first and training theory second. You can understand the book better if you start from this basic premise. You will understand why running 5 miles at certain speeds will have different effects or how to peak for a racing for a certain period of time. The science aspect makes the book a tough read, but the real value is Chapters 5-8. If the book were to contain only the last five chapters then it would still be valuable. Yes, a basic understanding of science is needed for the first four chapters. However, I find it hard to believe that concepts developed in the later chapters like periodization, total body fitness, race strategies, and training management were not of value to some of the reviewers. Newton give cursory treatment to these subjects, Jack Daniels does a better job in his 'Running Formula' (and would be the book that I would recommend to all high school distance runners), but it's BTDR that really breaks it down. BDTR will get you thinking in a whole new way about your approach to running.
I have to also say a word about the expectation that popular running books created for runner eager to learn more about training. Publications like Runner's World and the Running Times are known for their easy to understand training articles that outline how to get faster. Their publishers also publish books in this same vain. What is not questioned are the training philosophies behind the programs, its just a successful runner (active or retired) or coach giving the cliff notes version of their programs. I'm sorry, but a week in the life of Runner X does me no good if I can't understand where that week is in his/her training, why they are doing what they are doing (re: goals) and most importantly their training philosophy. I applaud the fact that they are reaching a vast audience of runner who really don't want to run a sub 4:00 mile (and that is needed), but I do. BTDR is not meant for them. Glover's book ' the Competitive Runners Guide...' is a good starting point but it is more useful to a beginner runner than a high school cross-country runner (different races different goals). This simplification has its drawbacks; it encourages the simple parroting of training programs without a full understanding of their impact. Do you peak for one racing period, two periods or cycle the program? How long should base training last? When do we introduce anaerobic capacity training? Important questions to a serious runner but a less focused runner could care less. BDTR is meant for those who wish to learn how to develop thier own training programs from scratch. Which means gaining a fundamental understanding of every aspect of training runners. It not enough to say run 10 miles on Sunday as your weekly long run. Why not 5 miles or 20 miles? Is it even worth doing one at all? These questions answered in BTDR and not answered in most other popular running books.
This book is not for every one. A high school runner may not want to know what the aerobic energy system is or how it works. Furthermore, s/he may not even care. Any one can tell some one to run 10 miles one day and 12x400m repeats the next, but if they can't tell you why you are doing that or what effect it will have on you then why would you want to give up your time and effort. For those that do have an interest and want to know what it takes to get to the next level then this book is gold.
Bottom line. If you are not serious about your running then this book is not for you.