The messy aftermath of destroying a government. I lived this, but I can understand why many people didn't. 

It's very different from Iron Widow, the tone is different, there's a lot of political discussions, and several important characters are side lined. 

It made sense to me. This was a young, uneducated girl, full of rage and hope, trying to survive a catastrophe she caused. 

I do think the middle section could have been shorter.  That portion got repetitive quite quickly. I wanted more heavenly court which will probably be the focus of the next book because it's now not a duology?