Ops do have very good burst but its not impossible to beat them lol. I play a sith assassin and i do perfectly fine keeping myself alive long enough to roast them. Also i too have not heard of any stim exploiting, and if your referring to grabbing the Exp damage buff and using the Stim damage buff that's far from exploiting because that is the same as grabbing berserkering in a WOW battleground and using a Berserker potion to increase your damage more.