The original is always better. 
 Picked this up on my little brother' Kindle on a lazy day. The book has a fun concept,but suffers from lackluster storytelling and characters. 
 The writing is passable, but includes too many references to dyslexia and ADHD that don't impact the plot or affect Percy's character. Having a half-god with these setbacks is good, but they need to have a point. Overall characterizations are shallow, with Annabeth easily eclipsing the insipid Percy. (Kind of makes you wonder why she wasn't the MC) By far the most interesting and sympathetic character was Nico, son of Hades. 
 In short,best for reluctant readers or those not ready to handle the original Greek myths. For better writing and similar ideas at this age level,try Fablehaven(series) or Artemis Fowl (series).