I beg to differ on the Conscript PPSh argument... but the SU-85 point is true enough.
I have used PPShs in the last couple of games and I didn't see any reasonable benefits. Defensively in green cover, I wasn't even able to slightly damage assaulting sturm pios on few occasions. Offensively at close range it seemed to me that PPSh accuracy is virtually non-existing on the move. How do you use them?