Chz
Stark Raving Sane
Doesn't that cover most fantasy and about half of sci-fi? Even Orson Scott Card's guilty of padding out his series.Unfortunately all of those writers had one or two novels in them but most of them went on to write dozens.
And then you have some authors who just don't know when the spark is gone. Larry Niven and Heinlein were both brilliant in their day, but they both shovelled out some really weak shit before they called it a day.

