I've heard Powertechs can put up numbers as good as any other class, but I really don't see any reason you would want a powertech over a marauder, juggernaut, assassin, or even an operative (rare as they are) for melee dps.
if ur pt/vg, mara,sniper, did not do top 1 or 2 dmg,
then u r a bad raider,
or u fail in endgame raid(in some lowbie raids, they may not top),
l2p, it is one of the top dps right now.
but they r sux at pvp, after BW huge nerf it just like merc.