This book gets 4 stars because it is entertaining, informative, and brief enough to not be laborious. If you like books that deal with a conceptual idea and then provides many examples so that you can have stuff to talk about afterwards, this should fit the bill. Is it the best in the genre, no. But is it not bad, and fairly interesting. Yes.
It did not get 5 stars, because it is not the sort of book that all lovers of this genre will enjoy, namely because of the book's structure and the wording of the subtitle. First, there is some validity to the reviewer that suggests the chapters are a bit disjointed. However, I didn't mind this. I felt the different questions which formed the title/thesis and "disjointedness" allowed the book not to be overly repetitive, a failing of many of the books in this genre of leisure non-fiction. That said, a friend of mine who read the book also remarked that the book felt too all over the map and so, I can not give the book 5 stars.
The second minor issue, as pointed out by another reviewer, is that the author does not fulfill all the claims of the title. The author does not explain "How complex things can be made simple", at least, not in any direct manner. There are hints that his point is that the human mind somehow reduces complex action into something simple, but that most are unaware that they are doing something rather complex. However, those that think this book is about HOW to make something complex simple, would be better off in Business, "How to", Speech and debate sections.
4 stars is a solid rating though, as it does fulfill the title and the first half of the subtitle, which is no small task. The book introduces the concept of simplexity in a number of different formats. It is quite fascinating to think about how the brain processes and learns. It's fascinating to see that monetary value and actual skills value do not quite mesh. Kluger introduces a number of interesting studies that are rather pertinent despite being in a variety of different disciplines. It definitely made me consider what exactly is the going on with the man v. machine debate.
If you are working directly in the man vs. machine debate as your job or academic discipline, that this book may be good for you to read so that you will have an even better ability to articulate these complex concepts to the average dude. It will most likely not tell you anything you don't know. If you are not in this discipline, than you could find this as interesting as other books within this genre of non-fiction.