I'm interested... What about Volks is so op? Their vet, which is worse than Vet 3 of most other units? Their AI, which is worse than that of most other units? Maybe their Durability, which is, again, worse than that of most other units?
The only thing I can see is an overabundant Panzershreck.
Saying 'Oh it's 90 munitions' is kinda irrelevant, because OKW gets to spend those 90 munitions on a really good AT weapon, whereas other factions do not get this chance.
I'd rather have a Riflemen with 2 zooks for 10 munis more than a 1 shreck Volk. If there is any infantry OP at the moment, it is undoubtedly Riflemen.
Joseph