The book that broke a series that already had some serious issues with representation and sexism. The stupid unknown-daughter-means-instant-fatherly-love plot was contrived as heck, but that could have been saved in some way still. Harry standing on a Mayan temple in conquistador's armour and sacrificing his love to genocide a mainly mixed-race vampire species was not the way to do it, however.

And I think the whole doing-terrible-things-to-save-your-loved-ones is a valid plot - if it's written with a modicum of care. See Order of the Stick for an example that's eerily similar while still differing in matters of gender, race and real-world reactions to your horrible actions.

In short, if you had a nagging feeling from the first books that maybe the series didn't merely depict a slightly sexist guy in a realistic manner, but that maybe the author fully condones everything that made you uncomfortable about Harry, you can see this book as the culmination of all the unease you ever felt about the series. Whether that's true, I leave to the readers. Personally, I couldn't continue reading The Dresden Files after this and was more than happy that I had borrowed in stead of bought it.