form your own opinion and read Mikaberidze : Russian Eye Witnesses of 1814
And yes indeed they stated they did not live better than serves in Russia.
N's rule did not do any good for France, the once superower was reduced to a power on par with other nations. While the French Republic could make peace with Prussia that could last, Napoléon couldn't - he used his massive power to alienate Europe - also by annexing states - like those in Norther Germany. If you weren't with him, you risked to be annihilated.