I had to read this book for a bachelor course. Honestly, I find it hard to judge this book, because my opinion of it is so heavily influenced by the context in which I had to read it.
Let me start off by saying I am absolutely fascinated by philosophy, and I was somewhat acquainted with the subject matter before the course began. For that exact reason it was not a punishment to read this book. If anything, I felt like I was really learning something valuable. Contrary to some of the books you have to read in college, I always came away from this one feeling like a wiser person for having read it.
Be that as it may, the reading load for this course was very high. And no matter how interesting something is, if you are made to read 180 pages a week, you will soon grow rather tired of it. That was definitely the case with this book for me. On top of that, some of the philosophers in this work (Foucault, Saussure, Derrida) are rather complicated in their own right. I found myself re-reading sentences or entire paragraphs non-stop because I couldn't immediately understand what was being said. And if you have to do that for 180 pages every week, with a book that has such a high information density, you will really get fed up with it.
Altogether I have mixed opinions. I am no expert and thus in no position to say anything about the contents of the book, and the extent to which what's said is true or approaching truth.
I learned a lot from it, and found it very clear in most cases. But the information density was very high and difficult concepts, names and definitions were scrambled across the chapters. Maybe it would have been better to divide the book in chapters per philosopher.