Why wHy WHY did Clare choose the name Kel for a main character?? It's such an unusual name, and there are already at least two (Mistborn and Darker Shade of Magic) other well established fantasy series with lead characters named Kel. Personally, I can't help but think of Mistborn when I read the name - just choose a new one!
I started off a bit unsure of this book as the prologue was nothing more than an inelegant info-dump, but I did get more into it once the story got going - how naive I was. 
I got to about half way through and felt that it was just OK, nothing breathtaking or mind blowing, but enjoyable enough to finish. 
Now at 60ish-% I've realised that I don't want to read another 250 pages of this. Nothing is happening. I didn't feel connected to the characters or care about them. The world is so detailed yet the worldbuilding seems fundamentally incomplete and lacking. The story seems unnecessarily complex and some characters aren't defined enough for me to tell the difference between them. The stakes are set so low, and you don't feel any danger because I instinctively know (probably from reading so much of Clare's other work) that everything will turn out alright. 
I'd hoped for a fresh approach/style from Clare to distinguish this new world from the Shadowhunters series, but it's the same writing and vibe, just in a different world.  
I will admit that reading this was relatively fun while I was learning about a large chunk of the worldbuilding, but now that that's over, there's no real plot to sustain my interest, and the things I can tell Clare is trying to do just aren't hitting. The story also feels quite shallow in a lot of ways.
Maybe if I weren't reading 'Blood Over Bright Haven' at the same time as this I would be enjoying it more. But anything compared to M. L. Wang will pale in comparison, and this one certainly did.