ok i was thinking about a 5v5 setup combo... Im an unholy dk and my friend is a mage so the plan was
3 mages 2 frost 1 arcane
arms warr
unholy dk
the mages could start by using the spell the multiples them and spam some awesome spell on a target and it would go on like that while me and the arms warr would run around help killing and defend the mages... tell me what you think (also mages could cc the healers 4evah while me and warr would nuke a dps :P)
5 DPS 5v5s don't work beyond about 1500. You might be lucky and get to about 1650, but that's it. Almost every 5v5 has a pally, priest, or warlock on it to dispel sheeps, and almost every 5v5 has 3 DPS that are easily capable of shreading apart a warrior and DK that don't have heals. If your warrior goes fully offensive, he'll be dead before the bladestorm is finished. If he goes defensive, the DK or arcane mage will be dead before he does anything meaningful.