The writing is good enough, I simply find most of the characters uncredible because they are either 1) evil, 2) insane or 3) evil AND insane. The bad guys are realistic enough, but that leaves me no one with whom to sympathize; it is just watching people I do not respect stumble around cluelessly until people I despise gruesomely murder them. That is wholly apart from how little Game of Thrones resembles any account I have ever read of the War of the Roses. "My book is based on the US Civil War, except with the Soviet Union, an alien invasion, incest and sadistic torture." In other words, not based on the Civil War at all.

Thanks for the heads up; if Sandersons view of it is anything like mine, that is just one more reason to read his stuff instead.