I really hate to say this but I really didn't enjoy Glass Sword as much as I enjoyed Red Queen. I still like it overall but it was just... lacking something. But that may just be a personal complaint. The writing style and quality remained amazing. I just didn't like the story this time. It felt like a bridge novel, I guess? 
 I think my biggest issue was that it just felt s o o o o l o n g. I had to go back and re-read sections because I stopped paying attention. I think we could have been spared some of the self pity, which probably took up at least 35% of the story. I think it could have been cut down to maybe 15% and it would have helped solve the pacing issues. It just grated on my nerves after awhile. Like, we get it Mare. You feel bad. OBVIOUSLY! It's a war. Everyone feels bad! 
 Also, it was really predictable. I really didn't see the twists of Red Queen coming but in Glass Sword I felt the foreshadowing was as subtle as a punch to the neck. (view spoiler)[As soon as Farley started barfing I knew she was pregnant and that Shade was the father. As soon as Maven started leaving notes for Mare to find at murder scenes, I knew she would somehow end up sacrificing herself to him. (hide spoiler)] But, since this is such a bridge novel, predictability doesn't matter much as its setting the stage for the final chapter. 
 OK lets talk about out heroine, Mare. Mare is in a state of transformation throughout. She's not just the little lightning girl who fell into the Queen's Trial and she's not a commander in the Scarlet Guard either. She's trying to figure out where she lies on the food chain. She's lost. She doesn't know what she wants, how to achieve anything, or what her end game should ultimately be. Mare is becoming more vicious as time and circumstance keep kicking her in the teeth. She's becoming what she hates the most, a power hungry monster. As a reader, I really don't like her at this point. But, I don't think I'm supposed to. We get an unflinching portrayal of our heroine. Even when she's not a very good person. She's transforming into someone else. Its unclear as to who that ultimately will be. Shes either going to become the hero or the villain. Time will tell. 
 P.S. Why's Maven got to be so evil? Jeez. :(