I enjoyed the premise, but I couldn't shake the feeling that this was some sort of wish fulfillment on the part of the author. And after reading a bit, it felt really "Night At the Museum"-ish. The characters that came out felt more like people at a costume party rather than the actual characters from the book.
The Justin character seemed rather weak, like he just can't let go of a relationship gone bad, and it always felt like he was just one step behind the story. I couldn't believe it took him that long to figure out that he could essentially rewrite any story he wanted to. Hell, he could have rewritten his girlfriend to be his dream-girl with the body of Pam Anderson (insert your girl here) and the mind of Alyx Vance (same). Come on. Don't pretend you wouldn't do it.