Kv1 is rubbish, lacks firepower against infantry (specially AT infantry) lacks firepower against tanks, lacks armour/hp to be a meat shield, not spamable.
b4 has a humongously huge scatter, it extends way further than the aiming reticle of the unit.
For Mother Russia is not enougth to save the doctrine, and overall in late with the current soviet infantry is not really that useful, its more like a amunition burn. (it could use some audio, it feels bad without urrahs or battle cries)
