In Napoleon's own reflections written during his exile on St. Helena...

War is becoming an anachronism; if we have battled in every part of the continent it was because two opposing social orders were facing each other, the one which dates from 1789, and the old regime. They could not exist together; the younger devoured the other. I know very well, that, in the final reckoning, it was war that overthrew me, me the representative of the French Revolution, and the instrument of its principles. But no matter! The battle was lost for civilization, and civilization will inevitably take its revenge. There are two systems, the past and the future. The present is only a painful transition. Which must triumph? The future, will it not? Yes indeed, the future! That is, intelligence, industry, and peace. The past was brute force, privilege, and ignorance. Each of our victories was a triumph for the ideas of the Revolution. Victories will be won, one of these days, without cannon, and without bayonets.

His ambition and massive ego made him into a tyrant, but he was certainly in opposition to an older and worse feudal tyranny that had ruled Europe for centuries.