First and foremost, if you haven't yet read it, endeavor to do so. It's the sort of book that caused me (with my short attention span and probably ADD based need to constantly multitask) to focus every jot of my attention on it and block everything else out while reading it. That in itself is worthy of note. The writing is, to say the very least, engaging.
I am a mythology buff from way back, and I had a great time trying to identify the huge assortment of characters brought into play. Some I guessed. Some I smacked myself in the head for not guessing, and some I'd never heard of and will be researching.
The book manages to blend strong flavors of both Tom Robbins' Another Roadside Attraction and Stephen King's The Talisman, while still managing to have a landscape, story and characters entirely it's own.