While everything else has gone downhill, Blizzard still makes by far the greatest cinematics. But out of all the things, WoW should be the last they should make a movie out of. Story and immersion are the first things that go out the window when the focus of the game is multiplayer or worse, it's an MMO. If there was to be another Warcraft movie that would be based on a game, it should be Warcraft 3. No contest.
Diablo movie however would be the best. It has IMHO the most interesting and pretty unexlored lore and stories. Starcraft would be okay too I guess. Basically anything except WoW. Other games can be safely ignored when it comes to movie-fying them as they are once again, uninteresting multiplayer only titles with no real story to speak of.
A full movie made in style of Blizzard cinematics would be bonkers good. I don't need live actors, especially if it is a game based movie.