This book is essentially a book of pictures of Al Pacino in most of his films, with a very short introduction, a full filmography up to 2009, and that's all. They probably were very obsessed by "The Godfather."
Was Al Pacino that important in American cinema? Probably by the number of films but many of these films are just good thrillers and they will not change the world, neither will Al Pacino even if he was in some films that were ahead of their times. "The Godfather" for sure in exploring the ruining of a young promising man by the Italian mafia. "Cruising" too on the gay issue in 1980. Just to give two examples. There are a few more.
The book is good because of the numerous pictures but it is nothing but a book of pictures, so do not expect a full analysis of the actor's style, of the topics of his films, etc.
Dr Jacques COULARDEAU