This is a great book; however, do not let the title fool you because it is on much more than just Foucault. While he is the primary focal point of the book, this study, while a little on the short side, applies a plethora of other authors and researchers from the likes of Nietzsche, Heidegger, Husserl, Merleau-Ponty, Kant, Darwin, and more. It is because of this that I must recommend this only after one has a conception of philosophy already, and to that point a conception that realizes the faults and shortcomings of simply Analytic Philosophy. Yes, this work is very much in what one would consider
Continental Philosophy, yet that does not mean it is gibberish or nonsense. As most other sources will tell you, including the book itself, this is one of the first forays into a Philosophical understanding of Foucault, and into the philosophy it goes. To use a euphemism this enquiry goes deep into the rabbit hole which is philosophy including such topics as Phenomenology, Ontology, and Epistemology.
This is not a once and done book, this is not even a coffee table book (although that may be how I slightly treated this book). This book is of the sort that needs to be reread once you have finished it to make some connections that you may have missed just because you are not sure what these phrases may mean, and in certain aspects, it will help with the understanding of the whole. In short, I will be rereading this again at another time.
Before reading this, I have not read any of Foucault's works. I am familiar with some others usage of his ideas, but one even needs to be careful of the because of the possible reductionism of other philosophers and social scientists not comprehending the full scope of his importance. Do I believe that I was missing out by not reading the works of Foucault first? Yes and no. I believe that in terms of reading Foucault's works first or this book first, I believe that either will work; however, that is only if, as stated earlier, that one has a conception of philosophy. Deleuze may first and foremost be a philosopher of Nietzsche, and he does read much of Nietzsche into this book, but he does read the others I have mentioned. However, it may be the case that Deleuze does this only because, as one would know when they read this book, that Deleuze is actually determining the "Strata or Historical Formations" of Foucault, which is the title of the third chapter of the book (this also has the subtitle of Knowledge). Deleuze also has a great knowledge of Kant's Critical philosophy and Heidegger. In regards to these two, the formation of the thoughts of Foucault was similar to that of Kant's Critical Philosophy, and Foucault draws much from the Heideggerian sense of Being. From the latter, the book focuses on the ideas of Language-Being, Knowledge-Being, and Power-Being. If one is not familiar with Heidegger's Being-in-the-world, then Deleuze will pose a problem for those unfamiliar with it. One does not need to be a Heideggerian or a Kantian, at least this is what I currently believe; rather, they need familiarity with the subject.
I'm sure as I read more philosophy my opinions will change. As I just stated, only being familiar with certain aspects can get the person through the work; however, that is not very convincing if you become a part of a philosophical debate. In that sense, this book is great for understanding the Universals of the picture, but it does not, or I have not gained the sense of the implication of the particulars.