Neither Hitler nor Stalin were good fighters, and neither were particularly apt at tactics. Stalin was a shrewd politician and Hitler a masterful orator, but it's pretty clear Hitler was an absolute idiot regarding military strategy and was specifically going for the most impressive looking shit, Stalin's strategy mainly working on throwing his entire population at the Germans.
At least Hitler's team would have flawless IVs.
If you want a challenge, try actual generals instead of glorified secretaries.