Cute but very childish. This is for much younger audiences, I'd have really enjoyed reading this in middle school; it's got the perfect mix of action, friends and family values, fun mythology facts and kick ass heroes. 
 Would I recommend this to my 9 year old niece? Yes. Would I continue the series? No. The only way I'd read the rest of this is if I'm reading it to/with a kid. 
 I'm giving it a 4 star because it's a great book for it's intended audience. So many books out there I wish I had read as a child. *sigh*. #firstworldproblems.