Additionally GRRM is only a writer you cannot expect him to be flawless - while I may criticise some of his recent writing I wont criticise the world he has created for being "too unrealistic"

An interesting fact came up in a recent interview with the guys doing the Computer RPG - they regularly talk to GRRM and show him areas in the game to make sure it matches his vision of the area - when they showed him the Wall his first response was "Its too big!", they pointed out they had made it to his specification. GRRM's response was "I've made it too Big!!"