Personally, I like Bismark as the German leader. He unified the German states into the Germany we have today. My second choice would probably be Fredrick the Great of Prussia (1712-1786), or maybe Fredrick I Barbarossa (1122-1190). Hitler did unify Germany into a common goal: extinguishing "inferior" races and uniting all Europe under German rule. I cannot, however, think of another leader in the game (other than Mao Zedong) who was so brutal.
My own personal opinion is that the leader should be Bismark, and that the UU should be moved from Panzier to something that the Germans had while Bismark was in office. The point of a leader and UU is to give us an estimation of who was the most dynamic leader in that civ's history, who was in leadership when that civ was in their "golden age". The UU best matches the golden age, since it is the way most civs get theirs (excepting those started by wonders, of course). The man or woman who represents an entire country throughout history in the game should be the one who was most instrumental in bringing about that golden age. The one the most people identify with (preferably in a positive sense).
I don't see very much in my readings about how cruel Mao Zedong was. I'm not saying he wasn't, just that it doesn't get mentioned a whole lot. And I read a wide variety of things, too. I do read, however, about the cruelty of Stalin, Lenin, Hitler, Nero, Domitian, and others. That might be why we have him as a leader. I don't like that, though, because I think China's golden age was long before Mao was an ache in his father's loins. Several kings of the Chin dynasty come to mind.
My gripe is not so much with the German leader, but the American one
. Why Lincoln? Why not George Washington, who was General of the Continental Army, was elected by a landslide in both elections, defined the Presidency for all who followed, and had to face the difficulties of starting everything from scratch. Or Thomas Jefferson, who was a leader during the Revolutionary War and whose purchase of the French territories in North America doubled the size of the US and opened up the Mississippi river and the important port city of New Orleans for trade. Or James Madison, a brilliant man who is known as the "Father of the Constitution", and who led the country through the War of 1812, also known as "The Second War of Independence". Yeah, I know what Lincoln did, but I greatly disagree with his politics and with what the history books say he was and did. However, this is opening a tremendous can of worms, and I do not wish to threadjack. I'll discuss this in greater detail, but in another thread.