3.5.
There is a lot that I appreciate about this book: Ben-Dov's tone is welcoming and approachable, and he explains the open reading style well; he is quite non-dogmatic and in several instances offers various options of how to approach things. His discussion of reading techniques using directionality, horizontal & vertical axes, and the visual language of the cards are clear and concise. There are some great exercises and spread suggestions.
There are also some aspects of the book I appreciate less. Perhaps most seriously, there are some significant issues with the history presented here. No bibliography is provided to support any of the historical claims. There is some definite gender stereotyping in some of the discussion despite the author's (welcome) clarification - repeatedly - that a card depicting a woman can absolutely represent a man in a reading (or vice versa).