In Azjol-Nerub you can start the "Hardmode" of Hadronox and since the introduction of reputation being rewarded for killing creeps it should be nothing new, though the mobs from the stairs which spawns every 3-4 sec rewards 2-3 rep each unlike much of the low health trash from other dungies, and they come in packs of 4.
I had accumulated around 500rep within minutes. And im currently using this to grind Covenant rep since i cba to do random dungeons or solo various dungeons and keep resetting them. For the setup i prefer a shammie of some sort for the Cleansing totem, other than that its just a simple regen fight and no biggie at all for the healer or tank. A pala tank just need to lay down Consecration to get on the mobs threat table and then hadronox usually finish them off
And i dont ask for rep, i just dont think blizzard intended this.