To make it more historically accurate, the unique unit should be called the Panzer, and the graphic should be of the Panzer III, which if you judge by kill/death ratio is the most successful tank of World War 2. The Unique Unit should be Armored infantry, the graphic should be a halftrack and it should have 3 movement.
Either that or ME-109 fighter, the most successful fighter of the war.
Further, Hitler is unsuitable as a leader for Germany because, as has been said, his rule ended with Germany physically destroyed and a relatively high portion of its population dead.
I would really prefer Frederick the Great to Bismarck because Bismarck arguably ed up Germany's long-term development by using political maneuvering to lay some of the foundations of the second world war. The other choice would be Arminius, which isn't technically accurate because he wasn't the leader of Germany, but he arguably had the largest long-term effect on German history of any known leader.
But I digress. The mod is good, but the Unique Ability should be something more military oriented--maybe the ability to "resettle" citizens of razed cities. Population of razed cities would be distributed randomly through your empire each turn of city razing. This would reflect the huge amount of foreign labor that the Reich imported from its occupied territories.
