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First reason is that dungeon ques are instant. Never had to wait ever .
2ndly because Dungeon Finder is random you sometimes get grouped with baddies , you know the dps that don't realise that the #1 above the bees head means kill it first and when tank gets 1 shot from final sting because the dps was killing something else you can leave the dungeon and reque within 15 minutes .
I have found within the first couple of trash pulls you can spot the baddies and save hours of time wasted failures. Of course the only way for me to get good dps would be to be dps but it takes hours to que as dps and then you risk getting fail tank so its just better to be a tank or healer .
Any other people think tank is most fun in this game ?