No other villain since Arthas Menethil (The Lich King) has had nearly as much development in the WoW lore.
Blizzard reduced Illidan into a generic bad guy in BC (Hopefully to be addressed in Legion). Deathwing was just "RAAARRAARRR, I'M A BIG EVIL DRAGON" and Garrosh was just a warmongering c***.
Gul'dan has been shown to be diabolical, manipulative and ruthless in his appearances. He takes delight in being evil and trying to bring his demon lords plans to fruition. Plus, what happens during the Broken Shore actually gives the players a true motive to want to kill him at the end of the Nighthold raid. All the aspects of a great villain.
Despite Warlords of Draenor being the worst WoW expansion, bar none. We can at least praise Blizzard for bringing this version of Gul'dan into the spotlight.
Who else agrees with me on this? Discuss.