Slate has an article on why not to cook from Mastering The Art of French Cooking. I suppose they have a point about some of the recipes not being what people want to eat today and being somewhat fussy. However, I’ve cooked out of it and enjoyed everything that I’ve made.
I also think the book has a different goal. Rachel Ray helps get dinner on the table quick. MtAoFC is more about experiencing cooking and food.
I might not make weekend night dinners regularly from MtAoFC but I don’t think that is a reason to own or cook from it.