Just wanted to share a few observations about the SMV Warlocks, located at Legion Hold -
They are a great resource for Marks of Sargeras and Fel Armaments. A Kara geared Rogue/Enhancement Shaman should have no problem killing these guys in mere seconds, and able to farm them fairly consistently.
An Enhancement Shaman is one of the best classes to use to farm these, since you have 1 interrupt and a totem to eat any stray casts that get through. Not only that, but skillfully using heals and Shamanistic Rage will allow you to farm constantly for hours with no stopping for mana/drinking.
These guys APPEAR to respawn based on how fast they are killed. I've noticed that if there are two or more people up there (or 1 person who is killing very fast) you will never see any less than 4 warlock at any given time, and as soon as the number drop belows 4, there is almost always a complete respawn at a tower (another set of 4). This indicated that there is almost no limit to the amount of people who can farm up there, I've seen as many as 5 up there with no fight over respawns.
Their drops are grays, LOTS of netherweave cloth, some greens and an occasional blue/pattern. My record for money made is 800g in two and a half hours.
Edits: The Elite Morgoronn (I think this one is the one that is up there) is soloable by some characters, namely feral druids and hunters, but really, he won't aggro you if you stay on the back side of the towers and just stay on the opposite side of him.
Also it starts out slowly, the respawns won't be as fast when you first land, but the faster you kill, the faster they respawn, so keep at it, and if you have a decent dps, you will see respawns out the wazoo!
Have fun!