Not my favourite of the series. It really peeves me when characters behave stupidly for no reasons, and when plot points would have obviously been solved if they had just talked to each other. Also, this is not helping me like Simon at all. 
 I did like the "main" storyline (villains and motivations, basically), but it could have been done better. Another thing I enjoyed was the relationship with the Infernal Devices series, reading the books in order of publication really pays off ! 
 I've been told this is the weaker point of the series, so hopefully it'll get better !