I just saw the 2021 animated movie, Injustice. Same basic story of the video game and comic series. There was nothing wrong with it. It had good animation, good pacing, good voice acting, good story construction.
The problem is, I read every single comic book in the Injustice and the comic series was a masterpiece. Roughly 110 comic books of around 20-24 pages each crammed in a movie just under 90 minutes. They did a great job on the cut all things considered. If you had to put everything in 90 minutes, they picked the best 90 minutes.
In the comics and video game, it took Superman five years to fall to corruption and in the movie it took about five months.
I really liked the comic series. Superman, Batman, Catwoman, Damian Wayne, Wonder Woman, Harley Quinn, Flash, Hal Jordan, and Black Canary all had very complex character arcs.
Plastic Man, Shazam, Bane, Sinestro, and many others had short but satisfying character arcs. There were hundreds of DC characters involved and it was great to how Superman losing his way affected everyone.
I mean, I got to see Trigon the demon fight Mr. Mxylplc!
But in a 90 minute movie, you only get to cover the bare bones. A lot of named characters died in the movie rather anticlimactically compared to the comic book deaths.
It vaguely reminds of Incredibles 2. There is nothing wrong with Incredibles 2, it just happens to follow The Incredibles which is practically perfect. Compared to "perfect", "okay" looks like dog turds.
That's my spoiler free movie review.