So my Horde guild did a spanner-run through Azjol Nerub recently: a level 79 Paladin healing a level 80 Death Knight.
The Death Knight opined that Azjol Nerub was the easiest of the Northrend dungeons. Somebody else suggested that this was only true if you overlevelled it.
The DK insisted that no, they'd done it fine at level 70 three days after Wrath came out, and that he'd tanked it at level 73 on his Death Knight no problem and that he'd "just used Death and Decay" which he informed me "does AoE threat".
I asked what he'd done about the skirmishers, and he insisted that he hadn't had any trouble with them.
How bad a tank do you have to be if you can tank an instance where some of the mobs randomly drop aggro and become immune to taunts and not notice.
He did, however, helpfully inform me that I just had to watch my threat.