First of all, I'm a libertarian, which makes me the type of person most likely to disagree with Mr. Slee.
I'll start with what this book is not. This book is not a critique of capitalism in general or of the market system. This book is a polemic on what Mr. Slee calls MarketThink, the belief that markets free from government intervention will *always* achieve the public good; as Slee puts it "The subtext for this book is a call for the reinstatement of collective action into politics." This book also serves as a relatively good introduction to the many ways that markets can fail.
On to the content. I really don't know where Slee sees all this MarketThink. Certainly many libertarians are guilty of MarketThink, but I don't know of *any* politician who advocates anything close to free-markets and very few who actively advocate freer markets. Even many educated libertarians say that the government has some role in regulating and correcting markets.
This book covers a wide range of market failures, regular externalities, herd choices, asymmetric information and a few others. Slee also does a good job explaining most of them. He is clear, especially if you have a science background, and he usually uses very good examples, though, once or twice I thought the examples he used were misleading as to the real world applicability of his discussion topic.
A few of the topics discussed in the book are not market failures at all. For example, Slee tries to describe lack of self control (having a large discount rate) as a market failure, which is not even slightly correct. I also though chapter six, "Divide and Conquer," on corporations, was not well thought out because it was not consistent with some of the ideas Slee had discussed earlier in the book.
Slee makes very few policy recommendations, and with good reason, for many of the market failures Slee discusses are essentially impossible for the government to fix without doing things like banning all fancy cars, and some have no readily conceivable government solution. Also, Slee's language gives me the feeling that he does not have a good understanding or awareness of Public Choice economics, which dissects all the ways in which *government* can fail.
On the whole, Slee writes well, his prose is easy to understand and he is quite engaging. He also has a good sense of humor; I laughed out loud several times reading this book.
I would never recommend this book to anyone who has not had at least introductory micro-economics, first, just to be able to understand what Slee is discussing and second, to avoid getting the impression that markets are completely hopeless without government intervention. If you've had at least basic micro-economics, and especially if you have a heavy free-market slant, then I would recommend this book as a fun introduction to market failure, but as with most things, remaining a little skeptical is a good idea.