I don't find his writing very enthralling in honesty. His imagination and the world he has created i do. I watched the first series on TV then read all the books, the story is good but i find his writing a tad repetitive. Not saying he's a bad writer but for me personally he over endulgies but then maybe that's the point, you fully emerse yourself in that world and love all the detail. Personally i love the characters but think it needs to be a bit quicker, i just dont understand how you can write almost 5000 pages and cover a few years in an epic saga. Surely Arya and Bran etc will have something significant in the greater terms and it goes against the basic realism of the books (in terms of how it's not your average boy saves world tale) would suggest that they have to grow up and realize their potential. To get to Book 5 or 6 is it? and Bran has basically got to where he is is a bit mental.
I read that he wanted to do a 5 year gap and pick it up but would have to miss too much out, well fair enough that would have been awful but by the same token surely he'll have to extend it beyond the 7 books he says it will be?
I don't know maybe it's just too detailed at points. You just keep waiting for the big stuff to happen, for the real outcome to get closer and nothing much changes it's just building and building and you don't get any sense that the building is going to end and the story is going to leap forward at any point.