In the end, he was a loser.
We are all losers, in the end.
What matters is what did we leave behind, for better or worse. In Napoleons case (the real, historical one), he changed Europe, and the world, in profound ways, for better AND worse.
You get a hint of both in literature, rec. the “Red and the Black” and “Charterhouse of Parma”, Stendhal, for what he meant just shortly after his passing. If you want a straight analysis, Napoleon is a theme running in background throughout Paul Johnsons “The Birth of the Modern”.