Rating this book is very hard, because it is a classic, and it is filled with fundamental truths. On the other hand, these thruths are not new, and they can be found in many books. You could even say that they are self evident.
The book has less than 50 pages, and of those pages about half are empty or contain illustrations. So it's a minor understatement to say that there is not much to read. On the other hand, every word counts, and there is not anything that's not necessary. However, when you read the book, you get a feeling that some of the principles are somewhat artificial, as if col. Cooper has tried to get the number of principles down to the magic number: seven.
In the end, when rating this book, I started with five stars. Then I reduced one star for the fact that these principles are not new, and Cooper has not invented them himself. Then I reduced another star because of the price, which is too high in my opinion. Nevertheless, this book has a place in the library of everyone who is interested in surviving in combat.