Just because it's a TD doesn't mean that it has to Penn everything it shoots at. Would you send a SU-76 against a T-54 or a Patton for instance and expect results?
Optimally, considering how early it comes in the game, I'd like to see SU-76s do well against German light armour and medium armour like Pz 4s, Ostwinds etc. It would be better if the SU-76 didn't do well against Panthers and Tigers and KTs and forced the player to tech to tier 4 where you have heavier TDs. I'd find it reasonable for the SU-85 to Penn anything.
