Well they really didnt have time to input all that lore in the game and thats actually what was Warcraft’s movie greatest weakness…they didnt really even have time to explain that it was Sargeras who was controlling Medivh, nor even had the time/opportunity to explain stuff about Burning Legion and that they were behind the corruption of the orcs. Ofc all of this could have been explain in later movies, but far better way to approach the movie would have been to start from the book “Rise of the Horde” and properly explain the background of the orcs and the Burning Legion…as it was, much of the stuff didnt propably make much sense to anyone else but Warcraft lore nerds, and even among us, most of us would have prefered the movie to follow the original lore.
Shame, the movie really was wasted opportunity, cause there would have been potential for so much more and better end result with different approach. The biggest fail of all in the movie was propably their decision to not age Khadgar at the end as result of the battle with Medivh cause “they didnt want to confuse ppl”…even though they had clearly shown before what happened to Durotan when Gul’dan sucked the life force out of him…
Honestly I felt like they even purposely teased the fans in the end, expecting Khadgar to look old, but he was fine like nothing had happened…really, such a shame…