A stuffy, self-important atmosphere is guaranteed to put me off my food no matter it's technical excellence. Then, I'm not a nouvelle or fusion type person at all, so I don't have to feel badly about not being able to go to some Michelin three star restaurants. That's not to say that eating at some of these world famous restaurants can't be a transporting experience for people who love good food. I've treasured each and every such experience.
However, most of the time, I'm perfectly happy with good bistro food, and I like ones that have a particular regional flavor as well.
Some of my favorites to add to Coolboy's list:
Cassoulet-slow cooked beans and meats, usually including confit de canard and sausage
Boeuf Bourguignon-the way all beef stew should be made
Confit de canard
(Yes, I'm a carnivore

)
Also:
Brandade-cod pureed and seasoned, mixed with milk and potatoes and baked in a casserole
Moules frites-Fried mussels with fried potatoes
My only complaint about French restaurants of any kind is that there's usually a surfeit of organ meat dishes for my liking, but again, that's just personal taste.
As for French cheeses, oh goodness, one could rhapsodize for an hour: Reblochon, Gruyere, Chabichou, Roquefort...unfortunately, cheeses no longer love me the way that I will always love them! Is there anything sadder than unrequited love?
Sort of what happened to Meg Ryan in French Kiss, both with the man and with the cheese...
