Three major disappointments: 
 - very predictable love triangle/teen angsty thingy going on (likely to get even heavier ahead) 
 - make up your mind lady, either celtic mythology or Shakespeare mythology 
 - just like Artemis Fowl, fairies and technology do not mix well - which is quite a sin since the plot depends on it 
 Oh, and Nevernever? Really? That is more suitable for a children's not a YA novel.