The attitude certain tanks have....

[Aleczan]

Some people are just new to the game and haven't mastered the technique to excel in party situation yet. I wouldn't get mad if my party fail if we discuss and try to improve together. Shit happens, failing just once or twice (when party members are cooperating and are nice) isn't the excuse to rage quit. I think that tank (in original post) was poor-mannered. At least say something, show some decency, be polite and don't just ditch people mid-dungeon. I, too wish there were Blacklist for Duty Finder.