What the fuck was that?
I guess it was an ending. Kind of. But cliffhangers are dumb unless the sequel is already being made and has an iron-clad outline. Since that is almost never the case this is another dumb example of Mystery Box storytelling. I swear that shit is a cancer that is rotting everything in media. If there's anything to be learned from Bioware or Disney, its that you probably won't be able to finish your own story, and whatever plot threads you left WILL be squandered by whoever does.
I did like the capstone dungeon. "Oh the good guys declared me a heretic, I guess I'll go murder them all." Really proving them wrong there aren't we? To be fair to the Cathedral, it's not like imprisoning demons in soulstones has ever worked out before. The games have never been clear what the difference between killing a demon vs. imprisoning it is, since they always come back either way. Not that it matters. Its really clear the story was cut to ribbons and stitched back together many times. There's no blatant reason for Lorath to offer himself to the
Hall of Heads just to find Lilith when a huge army is on their way to get her at the same time. Andarial and Durial were also poorly set up and there's no clear reason why they are even in the story. Seems like a plot element that was mostly cut but they had the boss fights made so they kept them anyway.
Finally, how TF can you have a Diablo game without Diablo?