Count me as a fan of focused writing! Both Robert Jordan and GRR Martin both had way too many tangential things going on in their books. Jordan would go off on tangents that were baffling, completely ignoring fan favorite characters like the main crew of kids from the town at the beginning of the story (Rand, Mat, Perrin, Egwene, Nynave) and focusing on boring, unimportant characters that, in the end, had little to do with the overall story.
Martin did the same, going far afield in Dorn and on Tyrion's river ride. And Brienne's travels. All boring, all detracting from the main characters. All worthless in the end.
And all of that crap slowed the story down. Jordan died before finishing his tale, and Martin probably is going to as well. I remember when Feast came out, and I lamented, oh, crap, he's pulling a Jordan. Man, did he!
Being a first person account, Jim really can't go too far afield like these other writers did, but I hope he keeps focus. I, too, want to live to see the end of this series, but if it takes him 3 to 5 years per book, hell, he might not even live to see the end. He's got, what, 8 books left?