So, I played the Doma Castle Dungeon with my Level 67-68 Gunbreaker recently. My equip for the Gunbreaker is about ilvl 270, and yeah, that's leveling gear.
So, from my experience with this dungeons I took smaller pulls, tried to clear each add-group one by one, because I know I could not take larger groups with my tank. One dps was rushing to the next group of mobs, kept dying, and was calling my way of tanking catastrophic. The healer was very nice and told the rest of the group that he/she would support my style of tanking, and that it is fine if I do not pull multiple groups at once.
Anyway, if you play dps or healer you will most likely never get into this position and into the center of discussion. I had to defend myself and explain why I play like this and had to live with the complaints of one dps - well, I guess that is what 'taking responsibility' means.
But, I still see the reason why many players avoid playing tanks, because you will inevitable end up in a situation where a dps or even a healer will start arguing with your playstyle. And I am not a person who enjoys arguing with other random players in an online game, I play in my free time to relax, socialize in a positive way and have fun.