Gotta agree with some other posters that the early war battles will be intriguing. The tables will turn for the Germans as they field Mk II, Mk III, Mk IV with the short 75, and Pz38t and run into some surprises in the form of T-34 and KV series beasts. I'm very curious to see how 1-man and 2-man turrets are modeled, as well as radioless afvs. Would you rather have better armor and a bigger gun or a loader and a radio?
And of course no infantry shaped charge AT capacity...swap those PFs, zooks, PIATs and Schrecks for anti-tank rifles and molotov cocktails.
Later in the war, I can't even imagine the impact of those 122 and 152 guns. Stay out of the buildings...