Seeing 300+lbs of green skinned muscle running around in a dress, and without the dark thematics the warlocks enjoy probably dosen't do it for a lot folks.
IIRC it was only Troll or Undead in Vanilla and Troll was reasonably underrepresented in many classes - the posture of males certainly didnt help and the nature of berserking in a pre haste world (there were some % buffs but not many in Vanilla) is not as desirable as the Undead racials. Plus Undead had a cool factor attached to them.
That said I played Troll mage in Vanilla and we weren't non-existant.
I really feel like there was another factor which I just cant remember that tied into the choice but its been quite awhile.
I wouldnt be surprised to see an increase in troll mages next patch with the beast bosses and the usefulness of Berserking.
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