My Reaction in a Nutshell: 
 Meh. This series is just plain meh. 
 The Long Version: 
 If you've read my review of the previous book, Shadow and Bone, then you'll know that I didn't have high hopes for its sequel. Overall the characters and world-building fall flat. There is a huge lack of chemistry between Mal and Alina. The two are about as compatible as a fish oil and jelly sandwich (translation: not at all). The Darkling is mostly absent in Siege and Storm which makes the book even more craptastic. Pretty much he is the only incentive to keep reading. I love how completely evil he is. 
 Alina has about as much personality as a rock and Mal isn't much better. The new characters (Nickolai, Tamar, and Tolya) help give this book some flare. But the book overall just falls flat. It is anticlimactic, the ending isn't "jaw dropping," and every character (minus Nickolai and the Darkling) are completely one-dimensional. Hell, I think Baghra ended up being my favorite character in this book and she only has 5 pages of screen time. 
 The beginning of the book shows promise. It's pacing is better (plus there was some thievery and who doesn't love that?!?) and I enjoyed the introduction to Strumhond. There are some mild plot twists, but they are very predictable. 
 Yeah, let's just say I've given up on this series. I found myself skimming the last 100 pages hoping that it would get better (spoiler alert: it doesn't). This series gave me the same level of "wow factor" as Daughter of Smoke & Bone did. So if you like that series, you'll probably enjoy this one. 
 ***TRIGGER WARNINGS: some mind control, war, death, murder