To read or not to read: City of Fallen Angels?

I had fun with the first 3 in the Mortal Instuments Series (by Cassandra Clare, in case there are any mixups). I didn't absolutely love them, but they're sort of a guilty pleasure for me. I have a feeling that I'm better off with the end of City of Glass, and I should forget that there's more afterwards. Did you like the book? Are Jace and Clary obnoxious when they can finally be together? Do you think I should read it or forget about it?