Rarely have I been so disappointed with a movie. There is so many terrible, terrible things that it's hard where to begin. Spoilers ahead.
First of all, the movie is constantly interrupted by so-called historians or veterans to divulge some documentary about the war, the occult research going on and so on, to give a sense of truth to the movie. Except, they ruin what little pacing the animation has itself, making the movie drag for so long pointlessly. Some action scenes are interrupted by these same interventions, and ultimately serve little to no purpose.
The main story involve Nadya, who is the only character who is remotely developed in the whole movie. But even that is a joke. She is an amnesiac (wow, so original) who is a member of the titular squad, and happens to be rescued by a monk who tells her she needs to stop evil Nazis from raising a dead knight. But the story does not flow - it's an briefing, the character plainly and boringly explains what Nadya must do. Then he is ambushed by what seems to be She-Wolves of the SS, and after a mildly spectacular fight (why the old man can even lift his cane is anyone's wonder), apparently dies.
Then Nadya is sent back into the underworld to find the spirits of her friends, to bring them back and to fight the evil Nazi undead knight. She is captured by zombies, who apparently take prisoner in this movie, and sent to a butcher undead wearing a pig's mask. After a miracle rescue, she is brought back to the living world where she meets again the old man for no real purpose. They expose some nonsense about moment of truth, then she summons her friend through sheer force of will and a boring fight ensues. In the end, the knight escapes, the Nazis who summoned him are still there, and her friend disappear without any conclusion. The movie does not end, simply.
Not only does the story make absolutely no sense, but the characterization is even worse than the worse Hollywoodian summer thrash. Voice actors have absolutely no emotions, and simply read their script. Subtitles did not always match the voice, the animation used a lot of stills for a movie, and the constant interruption of experts ruins the little fun you can have from this movie. There is nothing intellectual, either, as nothing is explored in any manner of depth. Words spoken only carry air, the historical facts are probably ripped off Wikipedia and there is no feel of urgency in the war. Even the horrors of warfare came up lifeless. There is no soul nor emotion in any part of this movie, and aside from two weak tentative, there is nothing even funny.
I give 2 stars for the action scenes, which are not completely worthless, and the character design, which is great. In some moments, the animation can also be amazing, at times, for instance the knight and the final fight are well done. Avoid at all cost, unless you're really into WWII and the Russian side of the story, but even that is awfully thin. If the whole length of the movie had been devoted to the actual story instead of the interventions, it might have been awesome. Sadly, it proves the line between awesome and awful is thin indeed.