USF by and large is fine imo. The WC51 could probably stand to lose its incongruous lategame support abilites (why does it need an artillery call-in?!) and maybe its crew, but beyond that everything seems to be working fairly well to me.
USF, UKF and OKW all work fine.
OST and SOV T2 are looking a little miserable, but I doubt it'd take much. Some careful adjustments to Conscripts and the Maxim for SOV and the same for PGrens and the Ostwind for OST.
Since OST where and should be the benchmark its USF UKF and OKW who are OP.
As for USF units go, here some examples:
Does AA HT really need to be one of the few units able to suppress on the move?
Does the HT really need to be superior to Soviet and Ostheer and be able to Drop medic kits?
Does the Sherman really need dozer blades to be better than Ostheer PzIV?
Does USF MHT need to be superior to Ostheer one?
Do USF really to have access to so many indirect fire weapons like, mortar, pak how, Major arty, Scott, MHT...
and so on
The USF revamp was a good decision. It was just a bad decision to buff so many USF units and take away all weaknesses USF have had because now they are for the most part just a better version of OKW.
I would actually call them a better version of Ostheer, since OKW still have tech limitations.