The mistakes:
1) Clown Cars being allowed to have infantry shoot out of the back
2) Conscripts not having powerful enough smalls arms fire to punish German player when flanking
3) Two man sniper teams, for fuck sake just make them a one man squad, this is not hard to understand
4) 6 man Support teams, being too hard to kill
5) Kv8 Flame is far too powerful at killing squads
6) SU 85 still fires too quickly and is too fast and too cheap
7) Being able to build T1 and then T4 straight away is joke and too easy
8) Soviets Mines are cheaper then German mines, why?
1. Not seeing this as hugely game-breaking, tbh.
2. Yeah, though that's more a general question of support teams vs small arms fire.
3. Currently in a better spot than the German sniper as far as utility and balance goes. Right now, a Soviet can win with snipers -> SU-85 but it's very dependent on having better unit preservation than the Ostheer.
4. Since the Maxim nerf, there are more ways to deal with most Soviet weapon teams than with MG-42s.
5. More accurately, I think KV-8 doesn't cost enough for how strong it is.
6. Ehhhh... sort of true. Or at least, the frontal armour, damage and speed and lowish cost all taken together seem a bit excessive. Would be better if a StuG worked as a modest soft counter to it. Kind of mooted right now in 1v1 because of some of the Ostheer early game edge. Once MG-42 flanking gets fixed then maybe the SU-85 will need another tweak.
7. In 1v1, as I said in point 3, this is absolutely dependent on keeping your stuff alive better than the Ostheer player does. Since the scout car changes made it so you can't rely on an upgun ruining the 222's anti-sniper capacity, it's a much more high-pressure/high-risk strat than T2->T3, where AT-guns and T-70s can often net you a comeback even if you slip up quite badly in the early game.
8. German minefield really needs something of a rework but the Teller mines are way more powerful and more reliable anti-vehicle than the Sov mines.
There are no unvetted ACs on the field by the time T-70 hits. And no-one just amoves their AC into a T-70. Shrecked Pgrens, Pfausts (who can btw one-shot T-70 if lucky) all exist and make the T-70 "rampage" a very short experience.
As I said, the T-70 is a gimmick unit that relies on exploiting an opening in your enemies defense. A good german won't have that, so T-70 is useless. The same is true for M3s.
T-70s are very good against infantry throughout the game, as well as extremely cheap (therefore get vet very quickly), fast and having a lot of extra utility (vet cap, self-repair, recon). I see a lot of very high-level Soviets use them successfully. I have never ever seen a faust one-shot a T-70. You probably hit a teller mine or something.