I mean it's definitely good, but I don't know that it's better as a whole than other branches of European cuisine (Spanish and Italian food spring to mind as equally good or better contenders).
So why is it that French restaurants are the gold standard for fancy food, French chefs are held in such high regard, and we use french words for so many foods/techniques/kitchen tools?
I can't give you an answer but I have read some interesting one in this post a few months ago: http://www.reddit.com/r/AskHistorians/comments/1of9gg/how_and_when_did_france_more_particularly_paris/