I enjoyed most WoW classes, definitely Bard, Druid and Wizard from EQ, all GW2 classes, even if they lack traditional roles, and some Lotro classes, especially Minstrel and Warden. Swtor is ignored because it's old school WoW in space (which has its merits, but class design is not one of them).
I suppose Tera warrior could be listed as a quite fun dpser.
On top it's mostly WoW classes, but in MoP or previous incarnations. WoD changes have been mostly a gigantic pile of dung in my opinion.
As a footnote, in the EoF period, I enjoyed a lot playing my EQ2 fury. A very nice mix of healing and damage, with strong single target and ae capacity. A very very good class, fairly immune to the gigantic skill bloat plaguing all the other ones.