Only in the context of books/movies/television can you consider the D4 story "bad". In the context of video games its fine.
No. Sorry you have bad taste, but shit is shit.
I mean, there are thousands of absolutely shitty books and movies made every year, so I don't see the point in generalizing them as somehow inherently higher quality or meeting higher standards.
And like books and movies and TV, despite a lot of shit, there are video games with good stories.
The only reasons losers say loser shit like that the idiotic and amateur story of Diablo 4 "in the context of video games is fine" is if you just have bad taste, low standards and are a loser.
Especially because a Diablo story is relatively easy to write. There's evil afoot, track and kill it... Without dumb shit like a main character dying because he's a retard or the chosen hero inexplicably being stripped of agency and letting some annoying brat super whiz Mary Sue trope make the world changing decision. Or, like not very obviously clumsily turning two different characters into one like it's no big deal like they did with the witch.
And maybe don't deliver the story through long sections where the hero is just running listening to voice overs. Or worse fighting during a voice over so you can't hear/follow what's being said.
This story was all angsty emo mood and tone and little actual character motivations or plausible action/plot.
It was a story for retards who listen to rap "music" because they like the best.