I had to bail on this one about halfway through: it was too diffuse and I realized that I just don't like the writing style. Like she did in the The Shock Doctrine, gets in the habit of repeating the title every few paragraphs, just in case you forget what you're reading. And there are capitalized terms, like Mirror World, and Shadow Lands that also get repeated often.
It kept shifting between a memoir, a political analysis, and a study in Naomi Wolf’s breakdown in a way that prevented me from ever getting any momentum or focus. Klein has a tendency to find patterns everywhere, and has a narrative approach to understanding history and politics which I don't especially like or agree with. And where she does discuss conspiracy theories, they were all (to me) familiar ground – though admittedly I stay very up to date with conspiracy news so figures like Romana Didulo are old news.
I basically agree with the New York review by Jacob Bacharach:
Although much of it is compelling, it does suffer from a kind of airport-book schematism, a habit of fitting too many phenomena too neatly into its titular conceptual framework. It is, in fact, a habit of mind and a tic of writing that has quite a lot in common with the conspiratorial style that Doppelganger critiques: a tendency to view overlapping and interrelated trends and occurrences as being necessarily causative of one another, guided by a central hand, designed; a tendency likewise to ignore the old saw about how difficult it is to disentangle malevolence and stupidity (a major flaw in, for example, The Shock Doctrine’s attempt to explicate the launch and conduct of the American war in Iraq). There is a frustrating tendency toward Capitalized Concepts — the Mirror World, the Shadow Lands — that can feel overbroad and too finely drawn at the same time. Klein is not unaware of this irony: The book is very much about the difficulty, even the impossibility, of escaping from the public doubles that we ourselves deliberately create. But it is an interesting question: Was Naomi Klein in the end unable to escape from writing a Naomi Klein book?
All in all: despite fervently agreeing with Klein’s views on the world, I don't especially enjoy this kind of book, and didn't enjoy this book in particular.