USF had similar performance for most units during GCS2. Stuart was the same, AA HT the same, 50 cal (iirc) the same, m1 AT gun the same, sherman the same, mortar was the same, REs were nearly the same (same DPS anyway), pack howitzer was stronger, the jackson was stronger, scott was stronger, LT was stronger by virtue of the fact that it came with weapon upgrades, and the m20 was much costlier though I would say better performing.
Considering USF's performance and presence in GCS2, I'd say having "every usf unit better than their counterparts AND giving them free squads" isn't quite the issue as you paint it to be.
(Also consider that a lot of the units the above would be compared to were the same or weaker - mg42 was the same, maxim was weaker; AT guns unchanged + raketen buffed; p4 and cromwell buffed; indirect fire was the same; TDs were the same, etc.)
Wow. Are you really ignoring that GCS2 was before the big USF tech revamp patch?