I just saw It, and as a hardcore fan I have... about a million gripes with this movie Lorewise, otherwise I'd have loved It to death If It displayed the lore and the story correctly... It's like, I don't see why you'd change the story at all. It was a good story, and could've been told In a fairly easy way I believe, you didn't need to change so much.
It's changed so much, It's not the Warcraft story we know, and It feels only like halfway through the First War, but with only everything that's happened In the First War that should've happened has happened so having a second part about the ending of the first war wouldn't make sense... unless they just jump straight to the Second War. And that'd be a shame, I wanted to see Stormwind burn.... I'm an orc player, bias Is obvious.
I don't wanna go on a large rant here but... comeone Duncan Jones, you didn't need to change much of the story at all, yes It was risky to show just this story to a movie-watching audience but I believe It would've done well anyway.