How do you see quest failure working in Skyrim? Should it be black and white, or with degrees of success? Should a player be encouraged to continue to play regardless of how well he has completed a quest? How do you stop players from reloading every time they fail to complete a quest perfectly?
Personally I like the idea that you can play the game, and can feel that you can fail quests without missing out on something good. That perhaps it leads to something interesting (in the same way that failing to cure vampirism, leads to interesting possibilities). The ability to have a character fail or partially fail would make you character path feel more unique, and encourage replayability. But is it feasible?