they just need to make taunt usefull - a bit longer range and no armor resisted (based on chance or enemy's intellect).
It's so sad when the game so cool overall, but some concepts make it's parts just frustrating and nonsensible.
Reactive armor is one of the few skills that reward defense with offense. If the armor system isn't overhauled, then one way to capatilize on enemy AI ignoring your tank, is to introduce more skills that punish them for going directly after your squishies.
With that said though, Taunt definitely needs a buff.