The quest The Art of Persuasion in Borean Tundra was a bad call on Blizzard's part.
I was okay with the Death Knight torture quest because it fit the Death Knight thematically. But this one is just out of place. Especially ironic considering the quest giver states, "You see, the Kirin Tor code of conduct frowns upon our taking certain 'extreme' measures - even in desperate times such as these" as the reason he is handing the prisoner over to you to be tortured.
My immediate thought was, "Hello, paladin here!"
It's especially annoying because it's on the main line to Coldarra and the Nexus. If you don't do this quest, you pretty much miss out on the entire Malygos conflict.
As I said before in Stories, Wrong Choices and Death Knights, there is a difference between single-player Western RPGs and MMOs. MMOs must have a shared reality and thus our choices are dictated by the quest designer. The quest designer therefore has the responsibility of making sure our actions are at least somewhat acceptable.
This quest crosses that line, and is a failure on the part of the quest designer.
(Also, you'd think mages would have a spell to force people to tell the truth. That seems like a very common spell in fantasy.)