i got no probs vs operatives when my defenses arent on cd.
1st use either knock back and leg shot or dirty kick, aimed shot, leg shot to get him away from u and root him. then use your standard rotation which should get his health lower than yours. when he comes at u again use diversion to get his accuracy down, when its over use dodge and after that defense screen while u pump out dmg. should give u enough immunity to get him down.
if things go bad u still have another leg shot and ur stun grenade as a way out.
if he stealthes away, heal up, if he comes back its a cooldown & energy race
oh and think about his defenses too
never played a scoundrel or operative, but i guess the also have dodge & defensive screen, but u should know the animation from ur own char