One interesting thing I have noticed is that ogres do not have any strict rule regarding how their two heads counteract with each other.
In the RTS, the heads seem to have distinct personalities, and the April's Fool joke about the ogre race seemed to imply the same is true in WoW; yet many two-headed ogres in WoW seem to have one personality only, and Code of Rule states specifically that Mar'gok's two heads work in perfect accord. And then we have ogres like Cho'gall.
What is this? A retcon for all two headed ogres + OG madness for Cho? A result of demonic and Old God magic?