While I loved the first three Jean Auel books, I rapidly grew tired of the main character, 'Ayra'. She simply became too perfect and too 'unique'. Quite the Mary Sue! The male lead became equally obnoxious.
In my humble opinion, anyway.
I totally agree. She (Ayla?) was perfect in every way and seemingly responsible for every innovation in their society. The first book in particular had some degree of realism as far as she was concerned, but the rest of the books gradually became more and more unrealistic. In my opinion this is a perfect example of an author becoming too attached to their characters and allowing the overall work to suffer as a result.