With Warbreaker, 40% of the book is the annotation, so there's a hell of a lot of explaining his thought process and the like. It's interesting, but too much for me. (Maybe I should read a chapter of annotation after the chapter of story, but the story was moving so slowly already.)

I read (and loved) his Stormlight Archive series (The Way of Kings and Words of Radiance, the next one is coming in 2016.) While they started slowly as well, it was more "takes a couple chapters before I realized I loved it" not "75% of the book goes by before much of anything happens".