Without any true innovation in the action-RPG formula, the long-awaited sequel is simply a monument to fear and live service bloat. Blizzard was previously a studio that defined genres. With Starcraft, it elevated the bar for the competitive RTS. With World of Warcraft, it made the MMO mainstream. And with Diablo, it reimagined what an RPG might be. I don't use whatever of that Blizzard in...