OberKommando Cheese
Well, pardon my opening the gate with a little bias. This isn’t about the OKW being overpowered, its not that kind of cheese. This is all about the huge flaws in their implementation and design. Lets start simple.
Don’t Do this – the original OKW. For those who don’t know, the original concept was meant to represent a resource starved, last ditch effort to defend the western front with a mix of hardened veterans and garbage. They attempted this... by trying to shoehorn in a totally different game into multiplayer?? A nation that was expected to only hold a tiny amount of the map with elite forces, only getting proper resources from sectors linked to your base via a chain of trucks that worked as your production buildings.
God I remember the old OKW which could resource switch into fuel and get huge amounts of fuel. I also remember volks being 235 mp and complete and utter garbage at some point. The WFA + UKF releases had a ton of issues that have mostly been fixed.
Personally I think the two worst implementations of faction mechanics are the vet 5 system and the lower resources that OKW had at launch. Both affect core parts of the game (Taking zones for specific income and the vet system) and for a while were nightmares for gameplay. Atleast both have been removed/fixed now.