As others have said, the audience for this book is mainly North American Christians; Hussain makes this quite clear. The book serves it's purpose, which is mainly to act as a primer on Islam, and confront the most popular conceptions/misconceptions in (Western) society. Having only a very brief introduction to Islam during my time in High School, I found this was a good place to pick up my learning, and gain a fresh perspective on Islam.
It is relatively short, reads nicely, and covered the topics I expected (mostly violence in Islam and treatment of women, though other topics are certainly addressed as well). It should be noted that Hussain, himself, is a Muslim, and presents his own defense or ideas on these topics, but (as far as I have read) makes the distinction between text and opinion quite clear. Something to take into consideration, but not an inherently good or bad critique, for certain.
I would recommend this for anyone who is interested in Islam and it's current conflict with the Western World(America in particular), and wants to learn more about the controversy surrounding beliefs and practices. For those looking for more detailed historical information or a deeper textual analysis of the Qur'an, you will not find such here, and should look elsewhere; Hussain includes such information, but it is very minimal, as it should be (considering the book's purpose and audience).
This book will not answer all of your questions; but it makes for a good place to begin finding answers.