Bobby Kotick, the former CEO of Activision Blizzard, made a recent appearance on the Girt podcast discussing his career in videogames and various elements of the publisher's history. Kotick at one point discusses Blizzard, and specifically what he felt were some of the developer's biggest issues with World of Warcraft: Making a movie, burning out Chris Metzen, and trying to replace it with Titan.
2016 saw the release of the World of Warcraft movie, called simply Warcraft, and the consensus is that it wasn't great: The film holds a 29% rating on Rotten Tomatoes. The film grossed $439 million against a $160 million production budget, so it wasn't a complete disaster, but you'd find it hard to argue it added much to Blizzard's flagship series. And Kotick just thinks it was "a terrible idea" from the start, and a major factor in the departure of veteran Chris Metzen from Blizzard in 2016.
