Totally agree, an equal battle centred around the Stalingrad period say would have been a much better setting. Panzer IV F2s versus T-34s. Relatively similar equipment, no silly Tigers to ruin balance, AT rifles would have a place and Stalingrad would be an awesome centrepiece for the game.
Panzer IV F2s vs T-34s only would be very cool. But I doubt it would be very popular because after some time everyone sadly would cry for a Panther/Tiger or ISU..