@jonn, if you're interested, go for it.
The confusion may be just a matter of how we understand the rating scale? I wouldn't consider a 3/5 a low rating (2, okay; 1, definitely). I appreciated the book, learned a lot, feel like it helped me with my own understanding of history, etc. If I had to quibble with it, I didn't like the final chapter (in which the author—to me, quite inconsistently with the history presented previous to it—proposes that Gottlieb did all these horrible things because of a genuine fear and misapprehension of the threat to, uh, America posed by the USSR, Communism, etc.),