I wouldn’t say Germans to much as Nazis, given that the Wehrmacht did not have clean hands but until partisans became a problem was generally disgusted with mass murder and such, as per old episodes. Now what the Nazi admin did was pretty horrific. Like most totalitarian movements it began with the democide of the elites, intellectuals, politicians, community keystones and of course Jews. A decapitated army is easy prey, killing all leaders in a conquered country is much the same, in theory. The Soviets did this too in occupied eastern Poland, which is why they massacred all those Polish officers in late 1939.
One of the interesting things the Nazis didn’t do, was abolish the collective farms, because they were easier to control and take food from. In my opinion Stalin was SO hated in Ukraine at least if the Nazis had done ONLY giving people their old farms back, the Ukraine might have been unconquerable in 1943, given the Germans would have immense popular support in the rural countryside where the most effective partisan operations could take place.
Also Time Ghost has some articles on Nazi behavior in the Batlics and how they quickly disabused themselves as liberators.
Basically the Nazis put Lebensraum into practice by being massive dicks on good days and being murderous psychos whenever they felt like it.
As an example:
The Direwanger Brigade’s biggest patron actually turned out to be Hitler himself. I know it’s a tautology at this point but I keep getting appalled on how many levels Hitler is a total POS. I should very well have the notion “Well it’s Hitler, why are you surprised?” But it STILL gets me hopped up.
If I ever get that time machine, baby Hitler is going in the Danube, no questions asked.