I have been playing quite lots of 4v4 and I found out it's hard to win without good team coordination. So I tried 1v1 with Soviets and found out personal decision made larger impact. Currently I'm having problems with ostheer grenadiers when they have their lmg upgrades and their snipers.
The soviet is not really desgined around having the best unit's, but has other means of defeating the opponent. LMG grens will bassicly always win versus your conscripts,
So a head on infantry war you're never going to win.
Therefore try to whidle down your opponent by making use of other
units and ability's. If you manage to kill 2 squad models of a gren squad, your conscrips will be able to chase them off the field. Mortars, mines, maxim machine guns are ways of doing this.
Guards with lmg upgrades are a viable alternative vs grenadiers, but ofcourse this forces you to lock in your docterine choice.
Ostheer sniper's are quite diffecult to deal with, one way of countering is building tier 1 and making a sniper yourself. But this is a heavy investment and very risky since you will miss the AT guns from tier 2. The best thing you could try is getting a flank of on your opponent and catching the sniper on retreat (a t-70 is perfect for this).
Another thing you have to realize is that your opponent invested 360 MP into a single unit, that can't
engage by itself or cap terretory. Try to punish this by putting alot of pressure on your opponent and getting as much
map control as you can.