I don't like of using call ins tanks always
What would I like to see?
1) Mark target to Commanders that don't have Call in tanks.
2) IL2 patrol for 180 amm is in a good spot but a bit expensive I really wish to use it more frequet or add more armor pentration for 180 ammo to inflict more damage to medium/heavy tanks. Or just lower the price of it to 150-160
3) I would to use ML20 arty if the price was not 600 but 450-500 AND decrease a bit popcap. Also, is a good Idea to allow all arty to move inside some circle to avoid divebomb or similar
4) I doubt in usefullness the vet 1 ability of medium and heavy tanks.
5) Scout car does nothing by itself.
Conscripts outdated in late gave having very low survivabilty in the late game besides they can't inflict damage.
If you did #3, I would build a sniper, an extra CE, 2 SU85's, and six ML20's, and spam mines. With roughly 24 large shells landing per minute, no place would be safe. Wouldn't be a fun game, for anyone.
Scout car is a great early game counter to Kubel, and just like the Kubel, it has a limited time of usefulness.
I think the real problem with Soviets is that the tech tiers were balanced versus Ost, and no change was done to either Ost or Soviet when Western Front came out. Now, if the Soviet player wants T3 or T4, they have to pay 240mp and 120 fuel for the privilege of buying some really lackluster units. Unless I really need a Katy, I'll skip T3 and T4 and just use call-ins.
Ost has it slightly worse, as they have to tech through T3 to get to T4. For roughly the cost of T4 + SU85, I can get 2 T34/85's or an IS2. Ost has the same problem, which is why you see so many commanders with Tigers used. I haven't added it up, but think that Ost loses the cost of a Tiger if it wants to tech to T4 and buy Panthers. Two Tigers versus one Panther is also an easy call in 1v1.
My suggestions for Soviets would be to greatly decrease the tech cost of T3 and T4 for both Soviets and Ost, or keep it the same but give the player a USABLE unit, like the lieutenant, or a usable building like the OKW Panzer Schwerer. As for the units themselves, I would only change the SU76 (full disclosure - I haven't tried the Ost Panzerwerfer). Since the SU76 was a field gun, the barrage should have the range of a field gun which is more than a mortar. Give the barrage a range of 120-160 and it would be useful. Leave the direct fire range the same.