Ok so I just got my pala to 80 so I'm definitely running heroics like crazy.
I was in Azjol when I got bored so I charged Hadronox before he had killed all the adds. We ended up fighting for about 15 mins before we all got OOM and died.
The good part is that a mage in my party claimed that he had got 10k rep plus. This could be a very good way to farm rep if u have a tabard. If anyone could confirm that this works and wasn't just a one time glitch it would be nice.
And I'm not really sure if it's possible to kill him with all the adds up since he heals himself for alot. Atleast with my group it wasn't possible so you're pretty much facing death but u get a good rep boost out of it.
I hope atleast some of you find this useful