Originally Posted by
Madkitty
It should in theory design groups to avoid clashing of class and roles. You will rarely see a combo of Warrior/DK/Paladin or Mage/Warlock/Priest as DPS. You may get a prot pala and ret pala due to it being different roles. To prevent competing rolls normally. It may be a case of all the members in the queue it crudely designs groups awaiting the tank or healer to complete the group. It may search those not-in those groups first then look into the temporary groups to see if there are any suitable to fit your group. It may be a case of what you group consists of and what is waiting for a group in LFG/LFR and trying to make an 'optimal' group with people who could technically roll on any piece of loot