Rather than read Robert Harvey, a relatively new author to the crowded Napoleonic scene who may be looking to make a name for himself by resorting to the usual Bonaparte bashing you might want to read a few books by David Chandler, an historian who is widely considered to be one of the few experts on Napoleon.

I have to agree with the 'Napoleon was a nigh genius/genius' crowd. When Napoleon was on top of his game he was almost untouchable.

The problem with saying that some of Napoleon's ablest Marshals were on par with their emperor is that some of them they truly were, at least in some aspects, on par with Napoleon. Once the reforms of the Revolution took place the French army became a meritocratic machine that produced the best officers and non-commissioned officers of that era. "A (marshal's) baton in every backpack" was a popular term in the French army of that period. Desaix was considered a true peer and rival of Napoloen and might have gone on to become Consul had he not been killed at the battle of Marengo. Davout, although he hailed not from poor or bourgeois beginnings but from 'landless' nobility, is considered by most military historians to be Napoleon's best Marshal and possessed a knack for martial, administrative and intelligence gathering matters that rivaled Napoleon's. Suchet and Lannes were also extremely capable and effective Marshals whose talents and skills were quite numerous

Looking purely at Napoleon's military endeavors keep in mind it took the combined efforts of the major powers of Europe to bring the man down... and this was accomplished in no small part thanks to Napoleon's mammoth ego that ultimately superseded his genius and lay the groundwork for the disasters that led to his eventual downfall.