Martin is without a doubt a brilliant writer, a master of wordcraft and storycraft. However, he does not epitomise all that fantasy means to me. ER Eddison, Jack Vance and Fritz Leiber, along with Tolkien shaped the genre, to my mind, authors like Gene Wolfe and Stephen Donaldson (along with other overlooked greats from the 80s and even 90s whom I hope to read soon) brought it to maturity, and it's writers like Mieville, Jeff VanderMeer and Jeffrey Ford who are pointing forward in fantastic new directions, while the likes of Martin and Erikson are both saving the mainline heroic/epic form of fantasy from the doldrums and giving it new life.
Simply, I've realised I read fantasy for the very simple thrills of encountering magic, monsters and mayhem. So a relatively 'real' world such as Martin's isn't sufficiently soaked in pulpy goodness for a cheap=thrill freak like me.