USF tanks are *not* the issue.
Shermans are good, jacksons and m10s are great, scotts are good, E8s are good, bulldozers are good as well.
Problem is
1) bad rifle scaling
2) poor performance of weapon upgrades such as BARs due to bad rifle scaling
3) poor performance of zooks in relative to their cost
4) bugged 0.50 cal
Currently the american 0.50 cal has the honor of being bugged in 4 ways and thus being horrible
4.1) bugged reinforce cost not having the 50% reinforce cut like all other MGs
4.2) focus fire set to :true meaning it has ocnsiderably less DPS than all other MGs in the game
4.3) bugged vet 2 which makes the 0.50 cal lose all the buffs all MGs got in the big MG buff patch (this is pretty huge)
4.4) target values set wrong meaning that stuff like pak-40s, JPIV, raketenwerfers, STUG III, stuff that is normally supposed to be very innefective againts infantry will wipe the 0.50 cals weapon team very quickly
5) poor performance of their AT gun to an extent
6) lack of good early game indirect fire. (mortar)
Then theres the significant number of useless units like the M8 greyhound, WC51, M3 HT, recon paradrop but i don't include them here since all factions have a huge number of useless units