I've been following this thread with interest but frankly didn't feel like arguing about the American Civil War. However if we get to talk about the Waterloo Campaign or Napoleon, I'm in.
In defense of Napoleon, he was always operating on a different level of most of his subordinates. His greatest campaigns and victories were lead by him personally, generally when commanding a smaller army. The exception of course is Davout's victory at Auerstedt. Save Davout, Lannes, Suchet, St. Cyr, (and Massena during the early empire none of his major commanders were anything more than brave.) In fact there is a cool story illustrating this. Nap once organized a rabbit hunt that most of his marshals attended. But the rabbit counter-charged and in the words of John Elting displayed a better understand of Napoleon's tactics than their hunters. As a result Massena got shot in the eye.
With specific regard to the Waterloo Campaign, Napoleon's pool of talented senior commanders was severely limited. Davout, his best marshal, had to serve as minister of war. Lannes was dead. Suchet was commanding against the Austro-Italian-Russian advance along the Med and winning a stunning victory. And St. Cyr defected with Louis XVIII. Ney was a personal favorite of Napoleon and Grouchy was a newly appointed marshal. What killed Napoleon at Waterloo was Grouchy's failure to pressure Blucher, a job that Ney would have excelled at. Ney, an aggressive if stupid officer, would have pressured the retreating Prussians at Ligny more closely and would have marched to the sound of the guns at Wavre. Whereas Grouchy, a cavalry man, would never have launch the numerous unsupported cavalry charges against Wellington's center. This would have left plenty of reserves for the coup de grace at Mont St. Jean in the evening. Plus it rained the night before preventing an early start to the battle. To say that Napoleon's defeat was inevitable seems a bit extremely given his previous track record.
Sorry for the complete divergence, but I saw a chance to talk about Waterloo and couldn't pass it up.
Back on topic:
Favorite US General: Sheridan
Best: Sherman