soo I peered over the faction on wowhead, the only thing it has are trinkets and those come from quests.
it was suggested to keep handin items for revered but wonder does the faction itself have anything worthwhile? because I would rather have bag space than horde a lot of junk hand in items 
thanks
They will add new recipes later and it’s part of the attunement.
Crafting recipes. Head, leg, and shoulder enchantments. Rare and epic gear. A bag. Naxx attunement.
Shoulder enchants.
Soon ™ .
Not right now.
Later on it will have patterns,items for the D2 upgrade chain and reduced/.free attunement to naxx.
good food in p3 without bothering mages i guess
^^ It lowers the cost of the item required, and since that item is hundreds of gold, and at least in Vanilla, gold was hard to come by so it was very much worth the time spent grinding the rep.
If you get Exalted with AD than your Naxx attunement is completely free.