The ideal higher geared mage. Mages on the same gear level as you (I'm assuming you're a rogue) have about a 60-70% chance to kill you. Versus a warrior however mages on an equal gear level have less than 20% chance to win (barring luck such as failed heals etc.)
That isn't the main issue though imo, the issue is that mages have no stun immunity while rogues have; they are unable to perform their duties as a support class if you play them like one sufficiently.
Why do rogues have stun immunity, though? I fail to understand. Warriors, sure, they are the class that is supposed to survive to support the rest of the team. But rogues...?
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