I somewhat regularly cook from the art of French cooking (or the way to cook and baking with Julia) and some of the recipes have not aged particularly well (for my taste at least) but many of them are still fantastic.
A lot of butter yeah... a stick of butter to make burgers, something that I never used butter for before, sure stuck out to me but it was really good. I just don't do it every day.
It has been helping me improve my cooking skills as well.
I still love the variants that the cookbook focuses on. I have a ton of cookbooks, and I have not seen such a focus on variants on the same recipe as is this book. I am sure there are others out there and this isn't unique to her, but it is my favorite part of her book.