From what I can see from the reviews, people either love or hate this book. The title alerts the reader to the tone of the book. If you cannot tune in to the lighthearted nature of the book, then you won't be able to deal with the humor displayed by the authors.
The dialogue is intended to move the question and answer sessions along. If you don't like their brand of humor, you can simply move on to the next question. The questions and answers covered a wide range of topics- some more serious then others. Some answers dispelled myths. Several topics covered common knowledge. Many responses provided interesting insight into diverse subjects.
Years after it was released, the book is still a ranked book. That speaks for the popularity of its overall message.