I also didn't really like Jerome. Most of the characters (Rory, Charlotte, Stephen, and Callum especially) were fleshed out and, although they were all "good" characters, they had evil and bad sides. None of them were perfect. Jerome was the exception. I've always disliked when the main character's romantic interest is absolutely perfect. No flaws, nothing. Just Listen by Sarah Dessen did a great job of making Owen dark but loveable, as did How to Say Goodbye in Robot by Natalie Standiford with Jonah. But Jerome just seemed too.....perfect. I wanted their romance to be more fleshed out, with Jerome being much deeper than he seemed. But I still liked the book.
Pros: The fast pacing, I was always on the edge of my seat, great fleshed out characters.
Cons: The predictability, it kept me up at night, Jerome.