Basically, the information this book contains is rendered inaccessible by the poor presentation.
Remember writing that paper where you needed more length, so you went back and reworded everything to be expressed in a more complicated way? That's this textbook. Sentences are needlessly long, making content more difficult to absorb. Word choices are fluttery and fanciful when they need to be brick-solid. The prose squanders my time and my attention.
Composition is bad. This book consistently names something I've never heard of, talks for a few paragraphs about it as though I know what it is, leads me to believe I've missed something and maybe I should go back and find it, and then finally defines the thing. Additionally, time after time something is brought up and then dismissed as being "beyond the scope of this text" or contained in proper detail in some other, future chapter (your princess is in another castle...).
Images are never anywhere near the point in the text that references them! Reading about figure X-X? Well, figure X-Y is directly adjacent to what you're reading, and X-X is two pages back. For an e-book this is impossible to deal with, and even for a physical copy this would be ridiculous.
And the jokes? Yes, it's got jokes. They aren't good. They aren't funny. They are meant to be a way of keeping the reader engaged, but they fall flat and they take up space I had hoped would contain useful information.
This textbook is awful. It contains mountains of good information, but the writing is so bad as to render the content inaccessible.