Zaalbar- awesome tank. Less so for PVP, as he has nothing for a taunt, but he's got taunt constantly, a lot of heath, and can regen health and protection with a zeta
Jolee- meh. maybe put something together under QGJ, but not there's almost always something better
T3- upgrade to droids. but really a droid only toon
Mission- is a hard to kill attacker. like Zaalbar, doesn't bring enough in PVP, and all that hard to killness is overwhelmed. and there's better scroundrel attackers in PVE... while better than Jolee, not exceptional
Zaalbar, t3, and Mission seem to have zetas that very much improve their performance. And I think all of them have a place, but it's more edging out older toons than pushing the front