First off all, the author is not mostly at fault here. She has tried to make Harry Styles look positive but no amount of sugar coating can hide who Harry Styles really is.
To be honest, I didn't read the biography thoroughly, in fact I skim read it yet I still was bored. After reading, you find out how superficial and small he is regardless of his popularity. He jumps from one woman to another, reflecting his womanizing character.
Most of all, I absolutely hated the cheesy, overrated description of him. Yes he has curly hair, so what? Many people do. I strongly feel that Harry Styles is overrated and the most stereotypical boy from a boy band possible.
All the book was about was his relationships, how he went through females, one after the other.
Overall, I wouldn't even recommend this book to 1D/ Harry Style fans as all the information in it, is what ever was in magazine articles but expanded on with great detail, most unnecessary.