Totally agree that the latter 3 are very good stories, especially Vincent and the Doctor, that was just a gorgeous bit of writing and acting there, but I thought 11th Hour was maybe the worst episode of series 6. I'm kinda surprised you like that one considering Matt was basically doing a Tennant impression in that one. I was greatly relieved when he settled into his own Doctor with The Beast Below and Victory of the Daleks.
I did my fair share of cringing at the Tennant-isms during 11th Hour but I decided that I liked Smith enough in the other moments to continue watching the rest of the series ( except for the one with James Corden in ).