WTH are you guys going on about? I was doing FL and DS 25H at 650 on my lock shortly after WoD launched. Between those 2, there are 3 fights that need special attention.
Shannox - Burn down rageface super fast, or use a pet class to interrupt his stun
Ultrax - DPS cockblock. Not really a mechanic, just a timer til twilight and insta wipe. Was unable to beat it on 25H til 650. On normal or 10, he has a lot less HP.
Spine - The mechanics suck having to constantly bounce back and forth between right and left sides of his back.
Every other boss is a joke in FL and DS especially at the welfare gear levels of 6.2. Its more painful waiting for NPCs to finish talking than actually killing anything. Pretty much, don't stand in shit and put the pointy end toward the bad guys.
edit: Forgot about the skyfire. The adds that fall off the drakes must die on the ship. If they fall to their deaths because you killed the drakes too quick, you wipe.