I completely agree. I was extremely disappointed by the entirely average photographs throughout this book. Most of the gardens are extremely badly served by the images - either they are of very uninspiring parts of the gardens, the same parts seen from a slightly different viewpoint or angle or just simply bad photographs - the picture of one of Bomarzo's most famous sculpture groups is (there is no other word for it) abysmal.
Many of the text descriptions of the pictures are simply lifted direct from the main body of text, making the reader constantly think "I've read this sentence somewhere before" - and then realising that they have indeed read it in one of the main paragraphs. This is sloppy and incredibly lazy, as well as profoundly irritating.
Many of Don's books are "personal journeys". I have absolutely no beef with this - if you write a book, you can put what you want into it. However, with this particular book, what the author wants to write is not necessarily what the reader or researcher wants to read.