I have a team of druid(feral tank), Priest(holy). and 3 locks (affliction) all 70, in outlands i have done no heroics because im sure id lack the CC for it.
but have done in normal mode, Hellfire ramparts, Blood Furnace, the steamvolt, underbog, slave pens, durnholde, shadowlabs, auchenai crypt, sethekk halls, mana tombs, the botanica, the mechanar(all except the second boss, was a real pain in the ass with the fire elementals you cant kill so i skipped), and half of arcatraz.
Have yet to go the shattered halls, rest of arcatraz and the black morass..
Does anyone see a way to do heroics unless you have a totally decked out tank or CC? like 2 mages, i cant see locks succy lasting too long in heroics