Well, I liked this book more than the first one, for a lot of reasons: 
 Is darker. Ronan has a dark background, and everything around him (and inside him) seems to be splashed by shadows and blood. I liked a lot his rol as dream thief and the scenes with the nightmares. Spooky and intense! It's pretty obvious why everybody loves him, and even when the main characters are Blue and Gansey, seems that the readers are here just for Ronan. And I can't blame them. 
 I finally got into the authors narrative,and I like it more now. It took me one book and a half, but finally, I can enjoy the narrative with fluency. Aaaaaaand: All this Ronan vs Kavinsky stuff... 
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 DUDE, I shipped them so hard! I think that the chapter when Kav teachs Ronan how to take things of his dreams was intense and sexy, even when they did not even touch! That was magic. I loved it. 
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 What I did not liked: the cowardice of the writer in the gay romance. I don't see her hiding that Blue is in love of Gansey or any other straight romance (wich I'm bored), but I see a lot of fear showing that (view spoiler)[Ronan is in love of Adam. (hide spoiler)] 
 I don't like it, I think that gay characters should have the same exposition of their feelings as any other straight character. And I think that we, as a generation of readers, deserve more brave authors in this topic. I appreciate the gay love in this story, is real, but barely there in the pages of the book. I know. Is not easy to break the heteronormative, because the writer thinks a lot about the public and if the gay romance will take away some part of it, but obviously, in this saga, EVERYBODY loves the gay characters, so, I hope to find more bravery in the next one. 
 And please... less Blue's romantic problems. I am tired of them.