Read with understanding
I like to read the comments on leadership books listed on amazon. I find recurring themes in the comments.
Complaining that the book contains nothing new. - My suggestion being the leadership books contain nothing new because there are grounding principals regarding leadership that each of the authors recognizes and are in their way pointing those principals out. The answers are many readers do not want to accept the principals and are possibly not ready for leadership.
Complaining that the author does not give them exact answers for every problem that arises. - There is no shortcut, and every book read should be expanding the knowledge base of solutions to the issues that arise.
Complaining that the contents of the book are over-simplistic. - The actual concepts of leadership are basic, and it is up to to the reader to find their method of implementation.
Complaining about a lack of supporting data. - Some aspects of life do not live in a world of empirical data. A fact of living life!
It is evident that many readers are not reading to learn but are reading with an I know better mentality.