It appears that most of the comments here are based on viewing of the ridiculous Showtime American edition, which cuts out, if I am not mistaken, more than half the film, is dubbed and, apparently substitutes narration for dialogue, of which there is plenty, as well as the narration, ostensibly Talleyrand relating Napoleon's story on the day of his death, framing the historical episodes. At a little over three hours, this is a spectacular epic, and I recommend heartily seeing the French edition (an excellent print in gorgeous color, if a little dirty by American re-mastering standards). It looks gorgeous -- much more interestingly shot, designed and lighted than Guitry's other color epics, "Si Versailles m'etait conte" and "Si Paris nous etait conte," both of which have a very disappointing, glaring flat look. Many interesting star turns, notably a weird Beethoven by Erich von Stroheim and Orson Welles as Napoleon's jailer on St. Helena, but also some excellent more sustained performances, particularly Michele Morgan as Josephine and Daniel Gelin as the young Napoleon. (As in his earlier "Le destin fabuleux de Desiree Clary", Guitry -- who insists that after Austerlitz Bonaparte became Napoleon, another man entirely -- casts the younger and older Napoleon with two radically different-looking actors.) It's a very enjoyable film, and, if you know French, well worth seeking out in the French edition (no subtitles, unfortunately). The American one is a complete waste of time and money.
