All these units have clear counters.
PGrens get wrecked by M3s, snipers, shock troops, and T70s (to use only units available around the same time, let's not bring the KV-8 into this). They get held off by Guards, Maxims, Penals, PPSh conscripts, and T34s until you can get those hard counters out in earnest.
Scout cars get wrecked by guards, AT guns and Ooorah + nade. Also, 70 ammo is a lot, so it means you will have infantry dominance since he has to cut down on riflenades and LMGs.
MG42 is over the top as of now, I agree. But M3s, snipers, mortars (dat smoke), flanking penals can give you an egde. If he's stupid enough to put them in a house, dance around it while throwing molotovs. At worst, Ooorah around them until vehicles can sweep em up. It,s what i do against MG spammers, and it works almost every time.
PIV are easy to counter unless they reach critical mass (which means you've been outplayed). AT nades from the flank, button, AT guns, T-34s can be combined onto a good anti-panzer force, and of course SU-85s still shit all over them. I still would like the T-34 to have more penetration, and maintain that both AT guns should have their accuracy buffed a lot.
So, as a Soviet player, I can honestly say that a player's skill matters far more than his faction as of now. There are some imbalances, but not enough to make either faction clearly OP. You can't blame X unit before blaming your own skill.
+1
the rifle nade must have a bigger range than a molotov in fact.
molotov-thrown : rifle nade- shot
and Im sure the molotov has the same animation time than rifle nade