
To use another example (sorry!), what about Molag Bal's quest? If Petilus kills you without the mace, then the quest completes even though Molag is unhappy and you get no reward. In my mind, imposing our own definitions into the game's system is far too arbitrary. Just a "Completed Quests" tab in your journal. The game has two categories for quest completion.

Yet running into the cavern and murdering her is invalid? Does that mean that every quest must be "succeeded" and not just "successfully completed?" Which of the three possible endings to Canvasing the Castle is the "successful completion"? if all of them are valid, then what distinguishes those three methods from the two methods of completing, say, The Potato Snatcher? (murder or questing?) Or what if Elante of Alinor (sp?) dies during The Wandering Scholar? That 'completes' the quest, and no distinction is made between that method of completion and the "correct" way.

For instance, is completing Origins of the Grey Prince by killing him valid? That is an option acknowledged and even encouraged by the game, but not the only option (for the record I complete the quest in my route, but I diverge.) I suppose that my stance is mostly philosophical if we are to pick something slightly less arbitrary as the 100% requirement, such as 199 completed quests, that an equally un-arbitrary definition of "completed" should be chosen. I posted it in the % definitions thread and no one objected, but it is a very valid argument either way.
