It could be a bad for a good.
Napoleon empire created modern structure of society: citizenship, equal rights for all, efficient administration, cadastre, meritocracy, valorisation of scientists and industrials...
But all this progress were under close control of one man, who had quite reactionary views on elections, social laws, and agressive use of diplomacy, customs, social reforms.
It was no totalitarism, citizens were not organised to spy each other, nor were they brain-washed by propaganda.
And it compared quite advantageously to other governments.
Still, it was a powerfull, militarised, hence agressive nation.
Perhaps having the conqueror defeated, long after he proved that citizen-based society was as stable, and much more efficient, than subject-based ones, was the right start for a peacefull Europe going through the process of industrialisation, national unification and conquest of civil rights ?
Anyway, european war had to stop somedays, and always-growing french empire proved a dead-end rather than a solution.