In my opinion, a well built sorc controlled by a skilled player should be the best.
With a good control of Teleport, Orb + CM, TS/Hydra, sorc is almost impossible to beat.

Sorc also forced the creation of the hacked item...hehe.
Most of the Ith CB and Bow has the 75% all resist (Silence), but that didn't stop the sorc...the resist on White gloves didn't stop them...then the all elemental Absorb on White Rings had ended the "ownage" of PvP sorc.