Chris Haga, former Diablo III Technical Artist uploaded a video shortly after the Diablo Immortal announcement at BlizzCon to share his point of view about the game, but more importantly to defend Wyatt Cheng, Mike Morhaime, and Allen Adham.
Chris Haga worked at Blizzard for 7 years until December 2011. A year before the Diablo III launch. He admits the game was not good upon launch, and praises Wyatt Cheng for turning around things until it felt more like Diablo II: Lord of Destruction.
NOTE: Not family or job safe. Some profanity spoken in both videos.
Thanks, @t2000exe for the heads up (via tweet).