I read an interview with Jensen Ackles in which he flat out stated that he was unhappy with the way Dean was being portrayed in S6, and now I can understand why.

This is interesting. I've heard Jensen complain about being stuck up in Vancouver or being overworked, but I've never heard him criticize the show's creative direction...if he's suddenly saying that he's unhappy with where his character's going, things must be pretty bad. Then again, I just saw Jensen quoted as saying he'd be totally on board for a seventh season, so he can't be that unhappy. Do you have a link to this interview by any chance?