Enemies will always CC your guys with glass cannon, so not much a tank can do about that. And taking it on the tank so he can take cc aggro seems ok, but meh.
A tank in this game for me is basically just the guy who has fortify, frost armor, and a few other buffs that other characters might also have like peace of mind. That and he has a shield and no glass cannon so he never dies. Other than that for me he was basically just my air mage.
There's no point in a "pure" tank, because he's obsolete to simply better team comps that dish out more damage.
