On the one hand, this book has lots of information that's not widely available, and may be the only book out there on this topic. That's a great thing.
On the other hand, it's poorly written, with terrible grammar, unbrowsable paragraph structure, and clumsy sentence structure. It's just very hard to read quickly, and the most important information is often buried in long paragraphs with completely unrelated topic sentences.
The book also contains an awful lot of analysis that lacks any perspective of the wider truths of the time period. Some of it is very obvious, and some of it is inconsistent or inaccurate.
Like I said, the book has a lot of good and unique information. It also has some serious flaws.