1. Poor pacing which is both anti-climatic and over focused on details that don't matter in the scheme of the story. This book could've easily been shaved about 200-250 pages. I'm not kidding. The story summary of "King's Cage" summed up in a nutshell has Mare being held captive by Maven, wallowing around in her own misery for a good 200 some pages while waiting either to be rescued or for some political conflict she witnesses to give her an opportunity to act like a badass and escape. (Though many times she's like "What's the point? I'm just gonna get captured anyway. Can't use my power. They're all too powerful, blah blah.") And then after said revolt comes into play, she has a momentarily happy reunion with Cal, some time with the family, jumps back into the fray of conflict, leaving less than 15% of the book to put in some key scenes of conflict. Much of the narrative felt like wasted space and time.
Granted, I'll give credit for a few scenes that furthered the political rift between the Reds and Silvers. I can name them on three fingers really:
Mare being marched like a puppet and causing doubt among the Scarlet Guard in their respective role for things - but we've seen this before.
Mare witnessing the union of Maven and his new bride to be a show of power and prominence. (including an awkward bath scene for sexual tension when Maven and Mare have a conversation about said pending union).
And lastly: Mare and Cal having to deal with the aftermath of a key battle that didn't go according to plan.
But even then, considering how much time it takes to get to these key points, was it really worth wading through about 500 pages just to get to those points? (Answer: nope, nope, noppity, nope, nope.)
2. Misuse of multiple POVs: This could be contentious because, for what it's worth, I liked reading Evangeline and Cameron's perspectives and I wanted more of a deeper experience with their roles in the story. Definitely not when they were essentially tooting Mare's horn, leaving less room to dig into their own motivations and contentions within the overarching conflict (and it's pretty bad when you feel like one of the characters highlighted basically has her sexual identity shoehorned into the story just to add conflict and not for the time and connection that it truly deserved. Same with another character whose sexual identity really didn't have a lot of time to expand or develop, these are things that happened off scene and left me wondering "Wait, where the heck was I when this happened?" )
That served to piss me off on several occasions. Dude, when you have multiple POVs, it's to get into the heads and motivations of the characters you're writing about specifically, not toot the horn of the main character. Mare has her own space for that. It doesn't need to be spelled out. I get that Cameron has a like/hate relationship with Mare, she doesn't have to tell me this. I get that Evangeline reluctantly has to call a truce with Mare because she has her own reasons for acting the way she does, that can be shown as well. I get there's a purpose to their POVs in the novel, but the way they were done just felt...very fillerish and empty. Definitely not what they deserved through the whole of this narrative.
3. Mare. Yes, Mare still continues to be the Achilles' heel of this series. This is unfortunate because for a while, I was willing to follow her journey even with how insufferable she was through the last two books. It was hard to care, but at least I still cared enough to continue.
At least until this book. It showed me just how this series badly wants to paint her as a badass, TCO character only to actually portray her as being very passive and a product of the plot points this series pushes her through. This is said even knowing that the experiences she's going through are supposed to be traumatizing and noting the PTSD that she suffers towards the end of the novel. I didn't feel convinced by how this was framed because other dystopian/fantasy novels have done it with much better conviction and connection and didn't drag their heels while doing so. When her powers return, basically she has moments of returning to her self worth, but in the end it's dampened by her self-centeredness yet again. Which leads me to:
4. The climax/the ending. Oh heck no to all of it. I honestly think if the pacing and characterizations were more solid, this could've not led into another book. That may be up for debate in itself, but there were two things about the last 15% of the book that upset me. From the scheme of events, Cal and Mare are training for a battle against Maven and his respective forces. Okay. (Even if some scenes feel like they're lifted too closely from The Hunger Games or Divergent.)
They get into that respective battle and fight with a few harrowing scenes to match (never mind that none of the extra characters here are relevant other than passing mention. There's even a point where Mare says she doesn't remember a character, and I'm like "What goes with the main character mind, goes with the reader" so whenever Mare says she's bored or doesn't remember someone, how would one expect the reader to feel?)
I was thrown from the story towards the very end because a key scene felt like it was missing between the battleground and the direct aftermath (which switches to Evangeline's perspective). I couldn't get past how it just took that leap and the climax/promise of that scene just felt relatively unfulfilled. Maven escapes their grasp, but...you barely get to feel that sense of defeat or frustration from the main characters involved because of the change in POV and how it just sums up events.
The second point of frustration: Mare's selfishness creeps up again in the epilogue, leading to the next book for obvious *drama*. "Choose me or your kingdom, Cal!" essentially is what it boils down to without rehashing the whole of the exchange. Never mind all of the political tensions the book has established up to this point. Never mind that Mare knows very well what's at stake and is like "I don't care."