I agree, there were no real stinkers among the individual episodes, but series 7 could have had a better arc for Clara. They set up an intriguing mystery with Oswin's death and Victorian Clara's death, but then that whole impossible girl mystery seemed to be picked up or dropped from episodes really randomly with modern-day Clara. Apparently they were deliberately going for more stand-alones after series 6 was seen as too convoluted, but then I'm in the minority of rather liking that year :(