Fake tanks

Is it bannabe to que for tank and not actually be one? this is rather annoying
had 3 fake tanks so far they have 6.3k or higher gs and think they are tough **** but end up losing aggro to me 6.5k gs all the time and even my 5.4 gs hunter pal keeps getting aggro
so clearly they are causing us repair bills and making us play differently making dungeons way less enjoyable my guess is ''its fine''
but if its reportable I will be damn happy lol
logically it should be like this
-Que as tank
-Play as Tank
not
-Que as tank
-Play as dps and lose aggro constantly