Anyone really disappointed with Mance? We probably won't see him again this season IIRC, and he really hasn't said or done much. I felt from the beginning that Hinds was the wrong choice. He is too subdued, he might have made a good Stannis. I would have casted somebody like James Purefoy or Dominic West as Mance.
As usual the scenes in the North don't live up to what they should. The chase from the white walkers was non-existent, the scale of the Northern Wilding Army has not been shown at all effectively, most of the time they are in small groups of people. There is no menace towards Snow from particular characters, they haven't displayed the clash of cultures, no mammoths yet but the giant was cool. And really, the scenes are just too short to give any time to develop.