The Nazis were incompetent criminals whose mythical reputation in warfare is wholly unearned, and whose utter incompetence was on display constantly. You should mock their drug-addled stupidity at every turn.
a lot of documentaries use literal nazi military propaganda films as b-roll, the fighters and tanks never ran that well under battle conditions
like 90% of the "competency" of the Nazis can be boiled down to first mover advantage and surprise.
they were successful in France because France built up defenses against a WWI-style campaign, never dreaming that the Nazis would take an entire army around a flank. Once the Nazis faced the slightest bit of resistance, they got wiped out in a hurry.
Poland and Austria essentially didn't have the ability to fight back. The Nazis just bullied them.
Their "success" in northern Africa was the same - no one dreamed they'd fight that far away, so Rommel had his stomping grounds for a while before someone actually fought him, and then it went to hell.
And well, the eastern front was a legendary disaster. The Nazis hit an almost entirely unprepared Soviet Union that had exactly one thing - fucktons of manpower. And that manpower won, simple as.
The Nazis were bullies, but they were piss-poor tacticians, absolutely incompetent at maintaining equipment or supply lines, wasted money on terrible pet projects that went nowhere, failed to recognize the advantage technology would have in the war until it was too late, and were generally blinded by ideology to anything that could have helped their cause.
The Nazis should be insulted at every possible turn, and treating them like they were anything but a fucktastic clown show is an insult.