This is the final, 4th book. The Worldwar saga keeps going downhill. Boring characters are getting even more book space for their irrelevant activities. Non-English names are getting sloppier (we now have Poles named Casimir and Wladeslaw). What's worse, the events are no longer credible. The "good guys" are getting too lucky too many times, and the aliens are getting too stupid.
By now, I am no longer surprised at men blushing and women laughing at sexual talk. Guess we just have to accept Mr. Turtledove the way he is. But his repetitive whining about the Russian winter and the strength of liquor is really annoying. I'm slowly getting the feeling that Mr. Turtledove would get a frostbite at 0C and die instantly if he had to drink anything stronger than port. And one of the biggest horrors of war, of which Mr. Turtledove won't fail to remind us every now and then, is that people sometimes have to eat black bread.
By the time I was reading this 4th volume in the series, it occurred to me that Mr. Turtledove's aliens are lacking a very obvious weapon, one that you can see space aliens use in almost every science fiction movie. Such a failing from a race that has mastered the art of interstellar flight is actually quite implausible. However, if they had that weapon, much of Mr. Turtledove's story would fall flat, so I can understand that he left that out and I don't consider it a serious flaw. It's just something you might find yourself surprised about.
One slightly more serious flaw which began to disturb me in this volume, though, concerns East Europeans. In the real world, East Europeans usually don't speak so vaguely, understating everything and beating around the bush like West Europeans do. They are usually much more direct. When they think an idea is stupid, they say so, instead of "I am not quite convinced that this is the best possible course of action under these particular circumstances". They can be ironical and understating and everything when it's appropriate, but in this book, I began to notice how Mr. Turtledove makes, for instance, Russians talk cautiously like Englishmen most of the time. That sounds unnatural.
The worst part of this book, as well as the series, was that absurd, pathetic, disgusting sob scene on page 120. I just can't believe that grown-up men would really act like that, even in the USA.
On page 467, I suddenly realised that the book was almost over, while the story wasn't. How can he solve all this mess so quickly, I wondered. Is there going to be a Hollywood-like big bang? No, there wasn't. But there hardly was a solution either. It only made me wish the series would continue - only please let someone else write it. I'm really fed up with Harry Turtledove's attitude, with his linguistic incompetence, and, most of all, I absolutely don't want to hear anything about most of his characters.
You will probably not take this advice, but my recommendation is to give this book a miss. I can understand that you may be dying to find out how it'll all end, but I think you'll be much less excited after you've seen the "solution" that is at the end of this book.