I dinged 80 after Howling Fjord, Borean Tundra, Dragonblight, a reasonable number of instance runs, and just a few quests into Grizzly Hills. I wasn't leaving zones 'til I had the quest achievements.
A lot of that was rested and I started at 70, not 68, fyi. Still, 68-70.5 in two full zones sounds broken to me. You've got to be missing some important questlines.
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