I haven't read Amoruso's book but business books are generally mediocre because they usually are written with the same logical fallacies. Most of them are either a businessperson extrapolating their unique circumstance to the whole world, or they are a study of a few companies that have succeeded without searching for companies that have failed using the same practices. Every now and again there is a good "philosophical" sort of book that challenges the zeitgeist. Those are the ones I usually like to read.