As a guy, who always loved the series, I always thought the character of Anne was totally feminist. I mean, feminism is about empowering women and removing obstacles so women can make a free choice about what to do with their lives, same as men. It's not about any particular person's choice, once she's made it.
It's perfectly feminist to *choose* to be a single, childless world-renowned surgeon. It's also perfectly feminist to *choose* to be a stay-at-home mom with six kids. To each, her own, eh?
Anne chose, after many years and twists and turns of her own, to settle down (in her way) with a family. I also found the filial duty aspects of the story to be interesting.