saw the movie. Have my opinion and i'll state it. So, if you don't want to have the film spoiled stop reading

Good news: I think the research on costumes was rather well done and there are no big errors. On the contrary, the splendour of uniforms and the movement and drama in battle scenes are one of the highlights of the film.
Downside: Two battles are depicted more in "detail", Austerlitz and Waterloo. Well, if you know anything about the plot of these battles you will find a entire reinterpretation here. It allows for spectacular and photogenic scenes but is historic garbage. Example: Austerlitz battle is depicted as if Napoleon has trapped the allied army on the frozen lake. Great imagery but the fleeing of elements of the Austro-Russian army across the lake is a minor side story of the real thing.
Big downside: I asked myself how such a history packed story as the entire career of Napoleon can be told in just a bit more than 2 hours. Answer: it can't. The entire narrative for anyone acquainted with a bit of history is patchy. Just impossible to comprehend many events. Even the "main story" - the relationship between Josephine and Napoleon is difficult to follow because of this patchyness. It could fill an entire film just with the story of their encounter and becoming emperor - here 10/15 minutes. The two actors do their best, but they are not helped by the film storyboard.
Conclusion: nice and grandiose scenes - no narrative, no depth and no satisfying plot. For someone not knowing anythying about Napoleon he will not see why many people see him as "great".
Well - that's just my opinion and I'm curious to hear yours
Greetings
Michael