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
I would actually call them a better version of Ostheer, since OKW still have tech limitations.
I am not sure is the suppression on aa halftrack so horrible. I know i was person who hated m5 meatshopper suppressing on move so it can be kinda hypocritical for me to say and i understand if you hate it, but us aa ht is very wonky to use and sometimes when i try to shoot enemy and chase them, my half track turns around instead of shooting them as vehicle does not chase it in reverse.
as for m3 halftrack i barely see anyone using it. I personally like it and see how medkits can be offsetting but okws free starting sturmpio can drop medkits as well fir same price, though they cant reinforce.
And someone mentioned the free units from teching i personally hate it, not as playing against but as playing as usf. I usually have 3-4 riflemen and then the either officer. If i need to backtech, im still kinda hesitant about doing it as i don't need another officer to take popcap and bleed mp. I don't want any additional basicly rifle unit when i have already additional officer. Imo the tech should just not include officer for free and instead be needed to purchased seperately like other units and they could be worked to be actual unique officer units, not ridle squad with single thompson instead of rifle and single additional ability.