I only have three things to say about this book:
1. This is Harry Potter except with mythology. There is no other difference. Three friends, on adventures, one's a girl, one's "the one", the main character has 4 syllables in his name, ad nauseum.
2. The writing felt second-rate. This may have been a factor of hearing it read by a not-stellar voice actor (I mean, let's give the baddies all California-guy accents, say what?). Still, it seemed rote, obvious, trite.
3. Stemming from the prior two, it was just plain... boring. You know where it came from, where it is, and where it's going within 4 pages. Good thing I was driving, or I would have nodded off.
I don't think I'll be following up on reading the rest of the series.