I like the book a lot and appreciate his frequent quoting of sources but I am constantly thrown off by his quoting his own diary and his very subjective statements about (mostly the Nazis) the subjects within. He uses a lot of adjectives I am really not used to in a history book like calling people “toadie” and “idiotic” and many more.
Again, I like the book and its personal takes are fun if nothing else but I can’t help but wonder if his own preconceptions shaded events in the book.
I have read a few books about WW2 but am just getting into the deeper aspects of it and don’t want some dude’s pissyness to throw a shade on my take of these characters.
This older answer by u/kieslowskifan explains why it's not the best source.