The author covers a lot of well-trodden ground before getting to the bulk of the argument, but that is to be expected from a book touting itself as an "introduction." I actually docked a star for two reasons. One reason being because I felt the flow between chapters was, in most instances, lacking a cohesion that would have made this book a better whole. As it is, each chapter is ripe for plucking out and dropping onto curriculum, so that is a bonus in itself- but not necessarily a positive trait for the book as a single book.
Still, this is a very good read about a relatively undiscussed topic. The other reason I did not give it 5/5 was because portions of the text feel a bit dated and could do with an update (specifically the discussion on virtual reality), but that doesn't necessarily undermine the arguments made by the author. However, it was clear that the author (at the time of the writing) was not entirely clear about how the internet functions and certain aspects, if corrected, would change a small portion of what they were saying. But that's probably just me being nit-picky.
Like I said before- this is still a worth-while introduction and it does a very good job of bring new readers into the ideas behind visual culture.