I'm sorry, but I also prefer my flag. It is simple (what a national flag should be), has this cool blue-white-red combo (in fact, "blue-white-red" or "tricolor" defines our flag, at least here), well it shows well on photos and paintings. Moreover, I like what is behind : no one almost spoke of the meanings, but I think it is as important as the graphics, because flags aren't paintings, they are symbols. So, for the French flag, it comes from the freshness of the early Revolution, where hope was high. The blue and red colours are those of the City of Paris, and the white part was of course the royal colour, so the idea was that the People of Paris and the King of France were "associated" for the good. The country was not imperialist at all at that time, we just had to defend againt those evil monarchies trying to beat our Revolution.

Fortunately we were able to push them back, and Louis XVI and his foreign mates never returned.
As for foreign flags, I think I like Canada, Liban, England (the red cross on white), maybe other ones as well. The US one is too dense, though not bad.
The ones I dislike are those of the Commonwealth countries in the Southern hemisphere. Australia, New Zealand and some other islands should change them and fire the Queen ! That UK flag inserted in those flags was a bad idea, graphically as well as for the meaning.