It's strange to see Russia in foreign movies. It doesn't look natural. Winter like europeans think it should be - when you see grass under the snow - but you will never see grass under the snow in winter. Especially in the 1812 Russia. Faces - even faces - look different, foreigners speak different, behave different. If they try to speak russian - they just look funny with their terrible accent. May be it's wrong to say, but they look stupid & not educated enough.
I saw just few episodes from the new "War & Peace", maybe almost everyone will say it's a good movie, but when you see an european man acting Bolkonskii - it's oddly, very oddly. And it's curiosly that actors speak english in the movie. It's unnatural. When you read piece in it's original language, you feel it different way when in the translation.
And, as usual, historical mistakes - for example - Christ the Saviour Cathedral in Moscow didn't exist in 1812, but you can see it in the movie.
Enjoy