Non-troll response:
There are three factors of "skill" involved in being a good warm body in WoW:
1) Gear selection.
2) Not standing in fire
3) Pushing the right buttons
1 and 2 are not class related. Some classes are more intutive to gear than others, but regardless of class someone who does no research will be badly geared, and if you do a minimal amount of research the gear selection process is essentially identical for all classes other than the occasional specs like affliction warlocks (even shadow priests aren't completely trivial anymore).
3 does have some variance, but only at the low end. A faceroller is going to do far better as a fury warrior or mage than as a hunter. However, regardless of class or spec a faceroller is going to be terrible. There is no spec where a player who can't handle a hunter shot rotation due to skill isn't going to be worthless. The difference in difficulty is like the difference in difficulty of various Kirby levels -- sometimes you just have to hold down the forward button until you win, and sometimes you have to dodge things while holding down the forward button.
None of them are a challenge, so who cares how they are relative to each other? At the high end, the simpler classes begin to develop some complexity. Everyone starts to deal with optimizing cooldowns for that half percent boost. Even destro warlocks become nontrivial once you're looking at squeezing out another percent of damage by better timing lifetaps.
There's only a significant spread in difficulty if you're satisfied with 80%, and if you're satisfied with 80% you're a scrub.
Finally, a quote by Zyla on a related topic:
Originally Posted by Zyla
Cunnilingus is much like being a resto shaman, you spam the button and let it do the work. So long as you change targets as appropriate you don't need to put any thought into it.
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