If you have someone who can cast a spray root, such as a Shaman (not familiar with other classes, so others may have similar AA abilities). Everything roots reliably, so CC is easy enough. After that the mission is trivial. My strat with my war/shaman/rogue crew was to spray root the mobs on incoming with the warrior flashing as they reached him. The spray root knocks the mobs back and out of melee range. Then the warrior pulls them in individually using grapple for killing, while the shaman focuses on CC using single mob KB root to stagger out when root breaks on the CCed pile. Keep tight control on pets or any damage dealing mercs, because they will run off and do stupid things, especially on the last wave. And don't damage the CCed mobs on phase 3, because once they have been damaged they periodically go inactive and clear any spell effects on them, essentially breaking root. But other than that, doing the mission that way renders it pretty trivial and it should be doable by pretty much anyone even with poor resources as long as they have those two basic components (tanking and CC). FF is by far the easiest thing to do in TBL.