It is possible to depict the career of a German officer, who belongs to the "old-school": A Prussian aristocrat from a prominent upper class family, who lives in a mansion somewhere near Köningsberg before the war, and who succeeds in every battle, but loses almost everything during the war and then in the end becames a prisoner of war. That would not be so big risk, because they who belong to this old-school category didn't like Hitler, and Hitler didn't like them, and they usually had high moral standards, and because of it came in conflict with the Nazis.
Although this might work, it's not really necessary.
First of all, I ask you to watch the BBC's review of Generation War which aired after the series aired in UK. There are a lot of good points about the war and German people. In conclusion, after 80 years, German people have to right to tell the story from their own perspective. We all know that it wasn't the EVIL NAZIS vs GoodGuy USF/UKF and less evil Red. A lot more complicate that that. I don't wanna derail though, but it's perfectly fine to tell the history, even if protagonist(s) are bad guys. Look at Breaking Bad. Dude makes tons of meth and kills people. Do you see anyone raging? No. And that's fiction. WWII is history.
One more thing, I don't want to act as a liberal douche, but no one has "morals" in a full scale -and complicated - war like WWII. A person with morals doesn't mindlessly follow orders. So why complicate things? PE campaign was done right. Nothing controversial about it.
Soviet campaign is BS though, and the Russian dude is not completely wrong. He said a lot of BS but he had some points.
Conclusion, give us another PE campaign. This is called "Enemy at distance" in cinema, you don't judge them by their morals. This is what Speilberg did with Saving Private Ryan. On the other hand, you have Tarantino has his inglourious basterds.