I read this book every August before I start school, and I've been reading it every year since I first picked it up almost 10 years ago. I'll agree with others who says it is full of generalizations only so far as this: What did you expect? If there were a specific, detailed method for genius, then we'd all be following it and our schools would be the top in the entire world. So sure, this is big-picture, right-brain thinking, and that's as it should be. Look at the work of Eric Jensen on the arts and thinking, or at the seminal culling of research and thinking that Daniel Pink and Richard Florida have done with their books, A Whole New Mind and The Rise of the Creative Class.
As an educator, no book in the past ten years, aside from Pink's A Whole New Mind, has had as great an influence on how I look at the students who enter my 7th and 8th grade classroom of a public school everyday, or on how I structure the environment of that classroom. As well, this book has had a profound influence on my own life and how I chose to live it. In truth, I feel far more in touch with my own capabilities and with what genius (in Armstrong's definition) I possess. Some readers might feel Armstrong is disingenuous in his redefinition of genius. However, Armstrong is quite clear and up front (it's right on the first page!) with how he is redefining genius. Itisn't so much an act of rationalization for his own intents. Rather it's a tracing of the etymology of the word, its history, and a reconnecting with the word's original meanings.
So if you're looking for a book that will tell you exactly what to do to create a genius, exactly how to think about what's wrong about the educational system, or exactly how to counter the societal impulses that counter our natural genius...look elsewhere. But if you're looking for a book to spark/awaken your own thinking about what's wrong with the way we understand education, with the way we treat our students, and which will ignite your own pursuit of genius, then buy this slim tome, read it in one sitting, consume it several times. You will not be disappointed.