What was wrong with Canvas the Castle?
Because it was easy to figure out if you're paying attention. You could figure out who's lying after talking with three or four people (one says they were taking star readings, and three others say it was raining; gee..), but you were required to take all the pre-defined steps to advance the quest. You had to talk to everyone before you could look for clues, you had to get all the physical clues before confronting the thief, and despite the thief admitting to it once you accused them with all the evidence, you had to have a high disposition to get a full confession. And without that full confession, you weren't able to tell anyone anything.
It's not even like there were any interesting twists, or the possibility to accuse the wrong person, or the ability to steal the painting back to make an alternate route through the quest. It was a fairly straight-forward linear quest, and forcing all the "plot points" didn't do it any favors.