Finally got to see this today and I have to say, I don't get the reception it's gotten. It wasn't flawless, certainly, but it was beautifully done and a really interesting story. I also don't get the charges about it being too confusing, since my only real exposure to warcraft before this was a frustrating five minute attempt to play the old rts game once more than a decade ago, and I followed everything perfectly. I also absolutely loved the way it set up this grand world, ending on a 'cliffhanger' as some have called it, because I thought it was actually really fun to see a movie of this type that didn't pretend that masses of evil and honest to god clashes of entire cultures could be solved with one big battle (and also refreshing to see a movie that's ok with killing off the main characters when it actually helps the story, despite some obvious franchising desires). The ending we got was more than enough to close this part of the story, and the choice Garona had to make was actually a better, more interesting twist than I've seen in any movie this year except for Civil War. (Garona was in general the best thing about the movie. Drakka possibly the second best thing.)
I will agree that some of the human characters could've been better handled. Lothar's son was extraneous and not interesting. Both the king and the guardian felt slightly hollow and unconvincing at times. And Khadgar did take quite a while to warm up to, though I got there in the end.
I also thought the final battle with the golem/guardian was somewhat underwhelming given the level of power supposedly on display (especially since the golem was so obviously foreshadowed for basically the entire movie), and there were a few moments in the big battle scenes where if you looked in the wrong place it became irritatingly obvious that they were basically nerfing the orcs just to let the human armies have the slightest chance at surviving (I swear at one point I saw an orc just stand there while a human soldier stabbed it in the heart). At the same time, though, I really loved the way they pulled back to those sweeping overhead views that really did remind of that sort of old RTS interface style - like the audience was looking down on a giant game screen.
There were really only two things in the movie that didn't seem to work much for me: first, the moment when Orgrim turns the orcs against Gul'dan only to have them all instantly change their minds again after Gul'dan kills a mere three turncoats (and why didn't he kill Orgrim then?) - if there had at least been a sign of some continuing tension in the ranks that was just being held in check by fear, it would've been fine, but they all charged off into battle like they were filled with glee, so it was jarring. The second was the fight between Blackhand and Lothar. It came out of nowhere with no explanation behind it at all and didn't seem to fit the previous 'mok'gara' scene in any way.
Overall, I honestly think this is mainly a strong indication of how purely obsessed with popular brands the general audience has become, because in terms of writing and characterization, this movie isn't any worse than Jurassic World or the Force Awakens.