Yeah those xp rates sound about right. If you have a 70 of almost any kind you can get better by boosting them. If you have a 70 paladin, warlock, or mage you can get several times faster.

I'm currently getting about 60-70k per hour average in the 60s. When I can pick up a set of multiboxing friendly quests, it's about 100-120k per hour, but once I run out it slows down quite a bit. If I'm completely unrested and have nothing but collection quests left, it's like 50k per hour.