I still haven't touched it. Diablo III was my last Diablo game. I played it on release and was shocked when the game just... stopped. There wasn't an end, but a "to be continued," hinting at future DLC to continue the story. It was suggested I continue playing from the start again to level my character further. But... why? I didn't play for a repetitive grind; I played for an interesting story. Which was incomplete and unsatisfying.
I never went back to Diablo III to see if the story was ever resolved. I'm avoiding Diablo IV for fear it's not going to be a complete game either. And Diablo Immortal can just fuck off. Do keep us informed how far you get before you hit a paywall, @OP.
I can't tell you how much I played the original Diablo in my childhood, over dial-up Internet with my friends. And I still remember how revolutionary Diablo II was with its in-game weather. No other game had that at the time! It's sad to see how far a franchise can fall in the wrong hands.