That's great but outside of the specific circumstance of being around someone who is incapable of using taunt, it's useless. Take a look feral symb statistics, each one has an application in both pve, pvp, and leveling. Whilst the warlock symb seems to be of use to you (I mean you specifically) and you alone, every 2 minutes. You're better off having the tank kicked.
My point isn't that it doesn't have some form of application. My point is that compared to other symbiosed abilities, it is incredibly, incredibly, useless not to mention inferior.