With all the lore of Ogres in Outland and Azeroth, the cunning but seemingly dimwitted ogres would had made the much needed brute force in the Alliance ranks, and their faction can be akin to Sylvanas's Forsaken; Amoral but still 'loyal' to the cause. It would had made a better choice for a playable DK with lore not needed to be retconned and would have a better story line in Cataclysm as Ogres are very special part of the Twilight Hammer.
Imagine this; Blood Elf is Horde exclusive, can be a Paladin which is an iconic Alliance class but cannot be a Shaman, while the brutish Ogre is Alliance exclusive, can be a Shaman, which is an iconic Horde class but cannot be a Paladin.
Draenei on the other hand, being the righteous and virtuous race, anti-demon, should be a playable neutral race; albeit would start of neutral with Orc due to the genocide, but I believe the Draenei can transcend beyond hate. It would be just more meaningful a NEUTRAL PLAYABLE race to be able to either be a Shaman or Paladin; symbolizing its neutrality. Draenei would be an awesome neutral race introduced in WOD as the race either have to support the Frostwolves or the Ogres, agaisnt the Iron Horde.