I proofread the upcoming Polish edition of this sourcebook.
Weird War II combines the historical background of the conflict with a turn toward the uncanny, magical and horrific, and it does precisely what it says on the tin... and unfortunately not much more.
There's a lot of fiction, both game-related and otherwise, that makes the Nazi-dark arts connection and it's an obvious direction for media like this to follow. Outside of a few out-of-left-field ideas in the Bestiary, Weird War II rarely strays far from the well-known standards of Nazi (or Japanese) Zombies, Nazi Werewolfs and Japanese weird technology. It provides a background for these things, but it does so in a very vague manner, which feels half-hearted. The "weird" in this sourcebook is a rehash of every cliche in the book, and that was very disappointing.
Outside of that, my other complaints are mostly down to how I like my sourcebooks - rich with fluff, and broadening mechanics so that they feel like they open up new options to the game master, instead of walling him in. Well, in the case of Weird War II, with its borderline-simulationist approach to statistics, I felt largely alienated. I appreciate the work that went into coming up with realistic approximates for the gnognards out there, but this renders much of the book useless to me. I'm not the sort of GM to simulate air or naval battles, so out go all the rules and statistics for that. Doing vehicular combat also isn't entirely my thing, and so that amounts to probably a fifth of the book being pointless tables for me.
Everything else is servicable, but there wasn't a part of this book that clicked with me. Nothing made me say "Wow, this is super useful, I'm so glad they included it!", but I did roll my eyes while reading some especially mechanically detailed passages.
It's a good book, don't get me wrong - and a must-buy if you want to run a WW2 game using the Savage Worlds ruleset. I just found that it doesn't exactly cover what I wanted from it... but then again, I'm not sure if I had a specific idea of what I wanted from this book. Whatever it was though, I haven't found it.