Fascists are grossly incompetent, and that’s one of the things that’s missing in almost all “satirical” portrayal of fascists
It is present in 40k tho.
Space marines are what fascists think they are while orks are what fascists actually are. Hell, even calling them orks gives them too much credit because orks aren’t that cowardly.
TBH, not all Space Marines are sane, or competent. That's really just a handful chapters, and specifically usually the Ultramarines. Marines Malevolent function basically in the exact same way that IRL special forces do (gleefully sadistic, murderhorny, criminal psychos), and basically everyone hates working with them as a result of that. It's really only when viewed at an absolute surface level that any of the things that fascists supposedly "like" about 40k appear to be even remotely correct, and even then only if you're wearing blinders.
The instant you start looking under the hood at things like the Ecclesiarchy & the Imperial Nobility it becomes extremely obvious that the rot is terminal & inextricable from how the Imperium as a society is structured.