Getting matched with an extra tank in QP= loss

I enjoy going tank now and then, but quite too often it will result in a loss as we also get a second tank and even somethimes a third brawler on our team. Against 3-4 enemy DPS. So we easily get out DPS’ed over time. So i am forced to not pick a tank.

It seems the roles need to be more firm. If one team has 4 DPS and a healer, the other team needs as well to make things more balanced.