I’m on your side here, I do think that DH is harder than people are giving it credit for. But I don’t think you’re using the term correctly.
It’s probably an even spread. The last time i was able to check with any accuracy was when realmpop still worked though.
If we count botters, Druid. Otherwise I’d toss out the holy trinity; Paladin, Hunter, and Druid maybe.
I see. Well, if you graph player skill against dps for each class, the bottom of the band vs the top of the band would be the minimum and maximum degree to which player skill could affect dps.
Whatever you want to call it, DH is simple to learn, and the dps difference between playing badly and playing perfectly is smaller than most classes.
Are we counting by characters or players? Because I have 17 hunters 
I’d imagine it’s the Hunter, due to how beginner friendly it is and being able to tame pets.