Before this film, my knowledge of “Warcraft” was pretty much restricted to the brilliant “Make Love, Not Warcraft” episode of “South Park” and that YouTube video of Leeroy Jenkins. Luckily, you don’t need any knowledge of the various other iterations of the franchise to enjoy this rollicking sword and sorcery adventure.

With Draenor, the Orc home world dying, Gul’dan (Daniel Wu) unites the Orc…