I'm not a Japan scholar, just a layperson very interested in Japanese culture. I bought this book hoping it would actually be, uh, an introduction to Japanese society (as the title seems to indicate). Instead, though, as the first review indicates, the author has some theses about present-day Japan that he's trying to prove. Fine with me, but then the title doesn't really seem accurate.
I was also hoping for a lot more about Japanese culture: literature, pop culture, gay rights, cinema, gender equality, etc. Instead, there are a lot of very dry chapters about the Japanese economy and the ethnic breakdown of Japan (though, in my opinion, not enough about the social implications of Japan's ethnic composition).
I found this book kind of dull, and the writing pretty dry. Maybe a great book for sociologists and economists of Japan (if they care more about the info than about whether the writing is stellar), but if you're just a random person looking to learn more about Japan, I'd look elsewhere first.