I think terroja simplified my opinion on dark writing the best when he said, ""If I ever wrote a book that couldn't be "bright" one minute and "dark" the next, I think I'd throw away my pen forever."

The truly "dark" stuff is writing that surprises you by throwing something out there that wasn't expected and makes you want to sick up. Belial, Dumai's Wells is a perfect example. I know you know what I'm talking about.