(See this review on Goodreads.)
I’ll admit that I was a little concerned about reading the second book since the first one was a little slow and the writing hardly held my interest at times. I honestly enjoyed this book more than the first one, however the writing still seems a little sub-par compared to The Mortal Instruments. I am finding myself feeling more vested into the fates of the characters regardless of the fact that I know some of the genealogical links to the characters in Mortal Instruments.
I still suggest that you read the latter before the former. There is still some mystery as to how certain relationships come about (although one relationship in particular seems to be a very familiar dynamic to Clary and Jace … in fact I might even go so far as to say its practically identical). In fact I think the knowledge you have from Mortal Instruments is probably what compels me to continue reading.