Sov has inferior non-doc roster and requires doctrines to function
USF is forced into bad choices in teching
UKF is UKF
Ostheer's vulnerability to AoE was dealt with by the squad spacing patches.
Soviet hasn't required doctrines to function since WBP buffed Conscripts, buffed Penals and gave Soviet T1 AT weapons.
USF and UKF aren't in the best state, but OKW is in line with SOV and OST.