On which data are your arguments based on?
Its not data and its not an arguments, its my subjective opinion based on my game understanding and possabilities factions have in early\mid\late game and how they can use them to snowball.
Random allies are harder alright. But for people who actually know how to play as allies and when they are not matched with idiots its a completly different story. Axis is easier with randoms its a known fact, and pretty much easily noticable via win rates.
I wasnt speaking about ranks specifically, but about player skill in general. Ranks rarely means anything, unless its like rank 18-19, anything below can contain complete shitheads who just bruteforced their rank.
I cant speak much about 3v3, dispite being 3v3 fanboy for a while. After that I gave 4v4 a try and decided to stuck with it, because 3v3 is objectively shit. Starting from the shit maps, ending up with how unpredictable it is.
But speaking of USF, just give a pathfinder spam a go, at least in 4v4.
vs OKW you can go even 3 PFs into agressive ambu and just push OKW off, since it wont be able to do anything to you.
vs Ost get 2 PFs - 1 mortar into agressive ambu. Spot MG with PFs and bomb the hell out of it or smoke it, ones you get your ambu ost wont be able to out-gun you with grens.
This is how all top USF players play pretty much, full rifles stats are either requare really good micro or really good teammate coordination to be effective, considering players are equally skilled.