Vs allies that know how to play this game you have to work alot harder as Axis in 4s. In theory allies will always win early game and Axis will always win late game.
Think of the team as one unit, like Jesulin said, Axis is like a fist and Allies are like a giant net surrounding you.
Major retreat point, ambulance, smoke, bars are all things that help you keep moving and constantly reposition. In theory you don't have to walk to your base after you've gotten bars.
Compare it to other factions and USF has in fact alot more mobility then other factions.
Though it's kinda a glass cannon mobile faction. Vs a good USF player you'll feel constant pressure, never enough time to heal up your troops.
After they buffed the Stug and gave it a higher price it arrivés alot later, thus giving allied light tanks a longer window of usefullness.
Though Ost have Fausts, Tellers and the great Pak it is kinda tough to handle Light tanks. Though imo they sacrifice a stock light tank for alot more stock options.
If allies go heavy light vehicles and Axis try to go for heavy tanks of course they're going to lose. Not a single puma made. The snowball effect of allies are strong in 4vs4 if every axis player sticks to a single lane. Have to treat 4s as you do 1s/2s, get a part of the map and slowly move out.
Though allies might be stronger, but imo not by a huge margin.
Allied mortars would literally hard counter super heavy tanks then, those things can't dodge for shit. But be my guest, USF is the one true faction for me. #believe