I felt very ashamed of not finishing a book, I honestly do. But this book really is formulaic and boring. 
 I don't get why these days paranormal teen romance have some "I am really AWESOME AND COOL" guy mocking around and acting as if hunting demons is some type of video game. 
 I hate Jace. I had to admit, at the exterior, he was funny sometimes, but he is a one-dimensional character: just cool, joking around, self-righteous, and basically babble about a demon to a total stranger. Don't he feels it's weird to say everything about demons to someone you just met and not really know - SHOWING OFF! 
 Don't even make me talk about Clary. She is just plain and boring, doesn't have any real characteristic. The basic Mary-Sue with a very mysterious past. Isabelle seem like another showing off, Mean girl type clique: 
 I am beautiful, I can kill monster, I am awesome. Jace will love me, not you, Clary." (But of course, our main handsome hero will fall for the plain heroine as usual, why not?) 
 I would have love this book years ago, if I wasn't so judgmental. But now, I think paranormal, YA book treat their subjects so formulaic and carefree. The bunch of teenagers in here acted as if they are some cool heroes and mocking around with demons. I felt zero tension at battle scene. Zip. Nada. 
 One-Dimensional!!! 
 What made me was more angry is that the author, Cassandra Clare, basically copy from her fanfic Harry Potter. Instead of the wand, we had the Runes thingy. Then there's a dark lord named Valentine. Original much? Jace was a romanticized Draco Malfoy. (J.K.Rowling must have facepalm herself 100 times whenever a teenager girl squealed at Draco because he's hot.) No dear, Draco is a representation of snobbish, rich boys who are insensitive, short-sighted, selfish and conservative. I hate the Draco Trilogy very much. Sorry, Cassandra Clare. I pick up City of Bones thinking you writing had improved, but clearly it isn't. You still had that red-hair Clary as an updated version of Ginny Weasley, Isabelle as mean-bitch Hermione (I am outraged!!!), Simon as a mashup of geeky Harry... And even a Minister of Magic kind of thing called the Council. 
 I don't think I'll watch the upcoming movie of your novel. Dang, it received tons of "Rotten" reviews on critics site. Need to prove much? 
 teenagers in leather pants who pretend they're cool + Mary-Sue protagonist + handsome hero + throw-in demons = won't help your story. 
 Even the snarky one-liners of Jace can't save this debacle. God hope some demons swallowed up Clare's manuscript. Amen.