The IS-2 scatter isn't from the drunk driver but the inaccurate 122mm gun that was rushed through production.
And the panther had speed governors to make sure the crew didnt explode the engine yet we have blitz... Accuracy when continent isnt a way to balance the game. Also the scatter is awful because waaay back the is-2 did 240 damage with great aoe and accuracy (read as squad wipe-topia) however it could lose to the ass of a tiger who had to rotate its turret and then shot at the fron of the is-2 (tiger would win with about half health). The GARBAGE pen and dps were changed. Damage was reduced and pen increased... Then it shot faster and wiped squads more... So it was made to never hit anything on the current battlefield and thats how it stayed for many moons.
I personally would like the is-2 to get its damage back and RoF liwered again now that it can hit targets and has the pen to mean a bounce (or miss) doesnt mean 20 seconds of dealing no damage...