I gave this book four stars just as I did all the other books in the series, but I enjoyed the other three more.
I liked how the earlier books had the luxury of focusing in on their titular characters' story; as each new character was added while previous storylines were also continued, that sense of intimacy was lost. I felt like I didn't get to "know" Winter as well as I got to know the previous characters in their stories, and because there was so much to wrap up, this book just felt like it had a lot going on -- maybe too much sometimes.
In general, things seemed to go a little too smoothly for our protagonists, especially as it related to the revolution. I mean, I get that Levana's subjects had been displeased for years, but everyone seemed to jump on board with Cinder and the gang a little too easily, in too short a time, especially since she showed up without much plan for how she was going to pull everything off. It felt like Meyer knew this was her last book, so she had to wrap it up, whether the timing was right nor not -- the revolution itself could have lasted for a whole book series.
Also, it really annoyed me when Cinder abdicated at the end -- I felt like it was a total cop-out, just because she didn't "want" to be Queen, when all along she knew she was doing it because it was her duty -- not to mention that those who don't want power often make the best leaders. And it just seems way too soon for the subjugated people of Luna to be ready to transition to a whole new style of government.
I also found my mind wandering a lot more often during this book than with the others in the series.
So, with all this criticism, why still four stars? Well, I really do find these books consistently fun to read. I love the characters, especially the female leads and their diversity. I like the way Meyer maintains a "magical" feel to her books within the sci-fi setting, and the way she manages to stay pretty close to the source material of the individual fairy tales despite all the world-building stuff of her own she has going on. I wouldn't say that I found the conclusion of the series disappointing, necessarily, just a little bogged down. I would still totally recommend the series, and I will continue to read ancillary stories set in this world (still need to pick up Stars Above and Wires and Nerve, Volume 1) and explore Meyer's other writing.