Napoleon peaked early in his career as supreme field commander. If he’d had more patience and aptitude for politicking, he’d have been better off, and so would have Europe. OTOH, we wouldn’t have “The 1812 Overture”, so...
In reading about some of Napoleon’s great victories during his prime (Jena, Austerlitz, etc.), I’ve been struck that some of them were rather closely fought, and the victory often depended on Boney’s subordinate marshals. It’s amazing that Napoleon and Hitler made the same mistakes: They took on Russia without first eliminating the threat from Britain, with its naval supremacy. Hitler even added the U.S. to his enemies, the U.S. having taken over much of Britain’s role as a world-wide naval power beyond the reach of continental European military power.