Operatives & Sorcs are the two biggest pains in the *** for me. I'm a well seasoned PvP player across many MMO's dating back to Meridian 59 so I can understand the frustrations when dealing with those two classes. Commandos can actually drop a Sorcerer fairly easily but the fact that Sorcerers can dish out high damage AND high healing, stun multiple times, pop a shield to absorb some damage ( usually twice in a battle due to the short cooldown), & run from a battle to heal, it makes them highly annoying to fight 1 on 1. You'll out damage them but they'll beat you overtime due to better survivability. Almost all Sorcerers go down the lightning tree as well since they can dump points into skills in the other trees that really pushes them over the limit. Skills such as...
Will of Sith
Sith Defiance
Calcify
Sleeping Darkness
Haunting Presence
After 31 points are spent down the lightning tree, 4 of those 5 skills listed above can be picked up going into the other trees. Just look them up & you'll be like what the ****. Operatives, well, they are self explanatory .
-LatinLegacy