I really enjoy my lowbie 3 x mage 1-lock 1 priest team.

One mage goes in shield up grabs a group of mobs Iceblocks and than they all AOE. Insanely fun to watch a large group of mobs drop in seconds. The combination of hellfire and holy nova is nice. One leeches life the other heals.

I think my next team to 80 will be all druids with interact target I can see 5 stealth feral cats being fun in World PvP. Dual specced they should be able to Heroic just fine.