The Dream Thieves

This was much better than the first for a couple of reasons, namely I find Ronan an infinitely more interesting character than the other 3 (living) leads. There was also a lot more action and less Blue being a typical YA girl even though she's so ~weird~ and has such a ~weird~ life. I also liked the larger role of Persephone and Maura.
Making the magic of dream control and real world manifestation more complicated by adding additional “Greywarens” (or at least allowing other regular Joes to have the same abilities without the control) seems unnecessarily complicated - the rules of the world in the Raven Cycle books are already pretty iffy and this is only book 2. I would like Stiefvater to give more explanation of these rules instead of just adding more and more elements that make things confusing.
The family drama of Mr. Grey's was also weird and went unexplained. If he could have just shot his brother so easily, why didn't he do so years ago? How can the encouragement of a near stranger (Maura) suddenly make him “brave” enough to finally do it, and then it's just so easy? If his brother was so cunning and sociopathic, he wouldn't have just followed in a car and put himself in a vulnerable position, even if he was grossly underestimating Grey. It was a silly subplot that added nothing to the book, though the Mr. Grey character himself was interesting.
In conclusion, Chapter 56 is the best chapter.