I'm surprised that so many seem to think that all authors should write at the same speed. Some just take longer than others for whatever reason. I'd hate to see them write faster just to appease these people and produce junk.
I'm also surprised that so many dump on the Dresden series for not knowing when to end when Jim Butcher has explicitly stated how long it is and that the overarching plot is already laid out for the whole thing. He's even given the names of the last three books