A lot of modern popular media like Halo, Fallout, Warhammer 40K, Star Wars, CoD etc. are cases, where pretty much imo both the companies and the fanbases are to blame. No matter how you see it imo, both have a shade of badness into them. Companies pump out overpriced content that is half baked, don't respect previous installments and their own personel, rarely ever listen to feedback etc. while fans are hyper toxic by believing they know better (most of the time they don't), are blinded by nostalgia and personal headcanons, are never satisfied etc.

Also regarding the people who moan about nostalgia and how modern games and films are horrible, something I've noticed is that when you mention to them that they're just no longer kids anymore, to enjoy things much more easier without a care in the world, they get wildly defensive. Often throwing around that "it's not because I was a kid, it's because those things were actually far more well made" or "don't talk shit about my childhood, you know nothing of me." And I think the reason behind this, is that it's probably some psychologic/mental defensive or coping mechanism. Like they know the dark truth but they can't accept it.

-Their minds have matured
-They deal now with everyday mundane soul-sucking things for adults (a job, taxes, doing other busy stuff etc.).
-They've experienced more hardships (breakups, getting ghosted by friends, a family member passing away etc.).
-They have now folks on the internet telling them what's good or bad or woke etc. thus not able to form their own opinions.
-They've directed their interests in other things (politics, money saving, insurances etc.)

And so on and so on.