At launch in SWG:

Bounty Hunter / Pistoleer = Fire Knockdown to Knockdown/Dizzy, then spam Eye Shot until dead. All the while your OP Pre-Nerf Probe Droid dealt massive amounts of damage.

Combat Medic = able to toss AE disease/dots from out of LOS.

Finally, up until the Combat Upgrade, any spec that stacked the Teras Kasi Precision Striking line and the Medic First Aid line.