I am quite new to the game but rocking it.
I would like to suggest that there are more battles to be added. I really enjoy Stalingrad and Berlin due to playing Germany as well as the Soviets, but I would appreciate more battles involving Soviets, perhaps in less urban areas.
Some more maps where tanks could be played well, as in larger more open maps would be interesting.
Other than that, the game seems pretty decent once you got into it.