I legitimately don't know how, half the classes are literally 1 > 2 > 3 > 4 > 1 rotations. Some aren't even that. I agree that there's some specs -- like Brewmaster -- that are inherently noob-trappy, but outside of those few exceptions most of the specs have become pretty braindead.
And even Brewmaster becomes braindead after you get beyond the noob trap and realize you should almost never Purify.