User blog comment:Tails365/A true tank's role/@comment-1330314-20140122195840

Damage doesn't exclude champions from being tanks. , and  deal a lot of damage but are still very good at tanking. The most important part of being a tank is that you get to attract the enemy team's attention: if everyone's focusing you long enough for your team to win the fight, then you're doing you job right.

You do, however, raise a point Riot is trying to address: bruisers are too strong. Champions like or  get to do so much they don't really fit a particular niche, and so get to do pretty much everything at once, which is why right now they get to destroy marksmen while ignoring most of their damage. There's a massive rework to fighter champions coming along, apparently, but it's going to take a really long time, since every fighter needs to be reworked at the same time so that no remaining champion becomes more powerful then the rest.