There's only two good mega-crossover movies.
One is Who Framed Roger Rabbit and the other is The Dragon Lives Again.
The Dragon Lives Again did the whole "Pooh's Adventures-tier autistic crossover fanfiction in movie form" schtick a whole lot better than Ready Player One, Space Jam 2, or Wreck-It Ralph.
I mean, you had Bruce Lee and Popeye the Sailor Man teaming up to save the Yama King from being overthrown by an evil conspiracy comprised of Dracula, James Bond, Clint Eastwood, Michael Corleone (who's referred to as "The Godfather" for some reason), Emmanuelle, and Zatochi the Blind Swordsman
Plus you've got naked women, toilet paper mummies, guys in Halloween costumes, and random usage of "Kung Fu Fighting" that was probably unlicensed.
https://youtube.com/watch?v=xhXbHZDZWAg
It was a lot more "genuine" in its autistic crossover cringe and less of an excuse to flex how much IP's a company owns.
(It probably helps that most of those crossovers were unlicensed and they only got away with it because it was Hong Kong in the 70's)