And as DP said, the Bounty Hunter pretty much fills that role on the Sith Empire side. Dying doesn't happen often and you can handle quite a lot on your own. At some point (esp. if you're a few levels above the enemies level) you can eliminate groups with one or two AOE skills, taking out enemies at a staggering rate.
Edit: @DP: yep, that's exactly how I do that, mostly for the Heroic +2 quests that I can do on my own.