I tank just fine in this game. I guard, I taunt, I wither, shock, and lightning. Tanking in PVP is about providing support to your team, not being able to fight 1v3 and pretend you're Rambo.
See somebody getting focused? Guard them, area taunt the enemy. You just gave them a few more precious seconds to go all out DPS and potentially even turn the tides of that fight.