I see nothing wrong, not only that there is a reason why shocks are so resilient. They are the only soviet infantry capable of not getting cut like butter by german infantry. They give the Soviet player another option besides gaurds, the only thing that needs to be changed is it needs to be put back at 2cp no one complained about it before.
Yes, they weren't used as much because by that point in that game you had perhaps 5-6 units out, were reinforcing squads with losses and it became a serious strategic choice whether to field a shock squad or not. At 1 CP calling one in is pretty much a no-brainer, and you can have them out before you need to think about your MP drain and future manpower needs.