Entire review hidden because of spoilers.
I had to think real hard before I gave this a rating. On the one hand, it was one giant action scene, and I'm a sucker for fantasy action scenes. On the other hand, as I get older good action scenes can often highlight the other weaknesses of a story. And boy does this story have weaknesses. Let's go through them:
1. Way, way too much going on. Characters appear and disappear almost at random; major villains from other books pop in to say hi and are never heard from again. This just cheapens prior books and is unnecessary--the scene in Graceland is especially bad this way.
2. The main villain of the book is boring. Essentially she is a kaiju with no personality whatsoever; the Fomor were actually scary, but she is just not interesting, perhaps because she is too powerful. The most interesting villains in the Dresden Files are the human ones, rather than the monsters; Ethniu has no real personality or motivation to speak of beyond "DESTROY EVERYTHING MUAHAHAHAHA".
3. Harry comes out of the book more or less in one piece when she should by all rights be dead or at least grievously injured, requiring much more recovery time. He goes from underpowered in the last few books, the Winter Mantle being nerfed, to ridiculously overpowered in this one, because otherwise he wouldn't be able to win. His power level seems to be whatever Butcher thinks the story requires, rather than what actually makes sense for his character at any given time.
Now we get to the big, gigantic, problems, all having to do with characters:
4. Marcone and Namshiel. This came out of nowhere and absolutely ruins Marcone's character, probably permanently. The whole point of his character is that he is a mortal that has managed to accrue power in the supernatural world by sheer intelligence and grit. If he suddenly has magical powers and is, by all appearances, nearly as powerful a wizard as Dresden, he just become another magical power. I know Butcher probably thought this would be an awesome scene, but I found it extremely disappointing.
5. We finally get an explanation of Nemesis, and it makes even less sense than the concept did in Cold Days. This is another thing that is ruining the series; Butcher already had an extremely compelling arc villain in the Black Counsel and the Outsiders. Nemesis simply complicates things unnecessarily and leads to unanserable questions--how many people can he (yeah, Nemesis is an actual person) possess at one time? If his plan is to shatter the accords, why take this overly convoluted route that ended up totally failing? I could go on and on about thi; it's become my least favorite aspect about the plot of this series.
6. And finally, Murphy's death is, bar none, the worst moment not only of this book but the entire series. She gets randomly killed by a minor character, her death takes up a couple of pages, and lacks any dignity whatsoever. If she had gone out literally pages earlier in the book, it could theoretically have been powerful and sad. But this... this was just appalling. And don't give me the "well, sometimes people die this way in war" nonsense; Butcher is a storyteller, he has choices about how to write these books. To kill off the most important character besides Dresden in such a slipshod, almost random and meaningless fashion, has gotten me the closest I've gotten to swwearing off this series.
After all of that, I almost feel like changing my rating to one star. I'll keep it where it is because the battle scenes really are pretty cool most of the time; since that's almost exclusively what this book contains, it at least succeeds in that. I'm only keeping with the series because Mirror Mirror sounds so interesting and I've been waiting so long for it, but I have very little faith that Butcher can pull it off at this point. For such a slow release, it feels like a rush job that nobody gave him good feedback on.
I thank NetGalley for providing me a copy in exchange for an honest, regrettably brutal review.