The Dandy quest was good because it was well written and had logical outcomes. You're a bore if you think the play wasn't fun. The end of Whoreson's quest violated every standard they represent when writing RPG's - interesting villains, varied outcomes and most of all, moral ambiguity. It was all shlock value and black and white. It was, I hate to say, the kind of morality you see too often in Bioware's games, and it feels cheap.
Well, I wanted to bash "Dandy's" head into a table at some point, I mean the play may have been fun, but the rest of it was mildly annoying.
(until the end of his personal quest chain course...)
I enjoyed killing whoreson, and I don't think that every villain needs to have complicated reasons. We have quite a few interesting villains as it is.
Having some villains which are just deplorably, inexcusably, horrible creatures that taint the earth with their mere presence, is just expected from the setting. (it fits the nastiness and general gritty atmosphere)