If you already know a lot about Japanese history and still want to know more, then read this book. Otherwise you'll be slowly wadding through a swamp of knowledge. Hall is very knowledgeable about Japanese history, that's very clear. However, he spends the majority of the book focusing on the Tokugawa period (80 of the 257 pages), while all the other chapters are usually 10-15, with a few around 20-25 pages. The one portion of history I am familiar with is Japanese history before, during, and after WWII. Hall jumped around in that 9 page chapter- sometimes discussing events in 1937, then 1941, and then back to 1937 with no chronological or thematic reasoning. It makes me suspect he did the same throughout the rest of Japan's history.
It's not an easy read either. Hall wrote this for academic purposes, and seemingly / probably to get fellow professors off his back with the ever present dreaded academia question of "yeah, but what has he published lately?" So, make sure to read about 20 other books on Japanese history that ease the reader into Japan's history, then read this one. Especially the Tokugawa period (1600-1820s).
Oddly what should be major events are left out or looped. The Russo-Japanese War (1905) is never mentioned. WWI- I think it might have been mentioned. The chapter on WWII, really 1932-1945, is only 9 pages long- pretty looped for key events. Also the occupation & aftermath of WWII chapter is also around 10 pages, quite a let down since he argues it was as transformative to Japanese society as the Meiji Restoration (which he spent about 40 pages & 3 chapters on).