If one unit is only good out of 3 then that is simply bad design.
Fully agree.
Lets come up with ideas how to buff sniper and M3 in soviet thread together.
Only it does not, neither riflemen or IS or VG work well with AT weapons. As of PG their are not mainline infatry and only 1-2 is usually build.
Rifles work very well actually, having AT nade and all and vet making them very durable, allowing them to stay longer in combat under small arms fire. RETs are simply cheaper and that's all, but it does not mean rifles are not viable for the role.
VGs have no AT, PFs do, but I don't see anyone complaining about them despite initial(including mine) concerns.
I have no idea why you would ever mention IS at all, knowing how they function other then "for the sake of an argument.
It does not matter how you want to label PGs, they are, just like Penals, an AI specialist with AT upgrade.
You can't pretend they don't count just because of different weapon profile and other semantics, I have never said "rifle infantry", I said "strong AI infantry".
And spamming penals isn't exactly a viable move at all either, you will have 2-3 penals maximum with 3 already being a stretch.