Blizzard has tried to reassure players
If you've not played the Diablo series prior to Diablo IV Gold now, this is not the right place to begin. I'd recommend Diablo III instead, which is available to play absolutely free on PC. For Diablo players, Immortal is at least worth checking out, but you should be aware that the game demands a lot your time -- or, more likely more than your money.
The Diablo franchise is in a bizarre state...