Today i started thinking, "Man, Shen'dralar really sucked. Unique librams and BoP materials to turn in for 250 reputation. I'm glad it's gone."
Then i came here and tought... which one is the most useless, pointless, annyoing (from a grind/turn-ins perspective) of all WoW?
Take into account:
-Meanings to raise rep (repeatable quests, killing mobs, dungeons...)
-Rewards at exalted
-Overall, how frustrating it is to deal with said faction
-Whatever springs to mind
You can also reply with "dumbed-down" factions (like Darkmoon Faire pre-nerf) or factions no longer in game, and explaining why you think so; but please, vote just for those reputations you farmed yourself! Too easy to say exalted Bloodsail Buccaneers is a pain if you never did it!
For me, it'd be Brood of Nozdormu at level 85, with crappy gear. I never really liked the way you earn reputation with them, and at the end i was like "Ahahah yeah!". Too bad the dragon went "GG, take this ring, bye". It was also frustrating, because first boss was a pain to solo for hunters, and overall i couldn't still deal with Bug Trio, let alone Twin Emperors.
Nat Pagle also looks like an eeeeendless griiiiind, but i cannot force myself to farm it, so i'll leave it alone.
EDIT: added poll. By "Alliance Forces", i also mean "Horde Forces" (at least i suppose that's how it's called, always been alliance...). This includes Brawler Guilds.