This was really good. I picked it up at the library based on a half-remembered review of it I read on io9; if it hadn't been in the "new releases" section I would never have touched it- I don't really read YA. That being said, I did read Afterparty a while back and really enjoyed that, so I forged ahead. I'm glad I did- Gregory's writing is very accessible, and that plus the first-person perspective of a high school kid can be misleading, because of all the terrible YA out there. Instead, Gregory has done a really interesting study of the style of YA books, and within this writing style has written a really interesting story with a sort of "Lovecraft meets Percy Jackson" theme. 
 It's a very post-modern book, with references to myths and other books (of course Lovecraft, just to start), but they're not spelled out for anyone. That might be part of what elevates it beyond its competition- it doesn't spoonfeed the reader, and I can see it being a preteen or teenager's first big cross-referencing project. 
 I suspect he's going to make this a series, which is fine, but I might not read any sequels (or god forbid, trilogies). I'm not really the target audience, but I hope it finds a lot of fans- it definitely deserves it.