The dominant warlords of Draenor are warriors (melee): Grommash Hellscream, Blackhand and Kilrogg.
Ner'Zhul (shaman/shadow priest) had to be threatened with the death of his clan to join the warriors.
Gul'Dan (warlock) was captured by the warriors and forced to open the Dark Portal.
Durotan (shaman) was defeated in combat by Blackhand.