Brute force you said? Allies Vet3=>better then OKW vet 5 if all you infantry (mostly just volk if you even get there) and let not talk about the weakness in Tank and Indirect fire of the OWK.Just do this comparison
Vet 5 Volk vs Vet 3 Shock
Vet 5 Volk vs Vet 3 Rifle fully armed
Vet 5 Volk vs Vet 3 Section with Bren and sniping LMG + Lee–Enfield.
Vet 5 Volk only win vs Vet 3 Penal and yet it is still a long shot sometime.
the rest like Paratrooper,Ranger,......Concript?Concript can't win right?Right?
Easier way to fix give OKW a doctrial that allow for a TigerI call in for the late game, need some sort of heavy tank that can stand their ground and support infantry.
Perhaps original idea of faction, but balance patches over the years have changed that.