Nobody Likes Mordekaiser
The Mordekaiser rework was a failure. Brushing past the fact that it destroyed his identity, he is extremely unfun to play against, and (for the majority of people) to play as well.
The amount of people crying (just or unjust) for nerfs just show how antifun and uninteractive he is to play against, and if you nerf him, he'll be useless because he has no skill expression and is merely a stat checking champion. He will always be too strong or too weak, there is no avoiding this with his current kit.
He needs a revert (never gonna happen) or mini reworks in his kit. There have been countless suggestions since day one on potential changes to be made, and the fact that Riot hasn't even attempted to change anything other than a hotfix nerf and a small number buff shows similar distastefulness that the rework was handled with. Nobody cares about the champion. Not enough to finish his skin VFX during the rework, not enough to keep his identity or try to maintain his playstyle / skill expression, and not enough to make ACTUAL changes to make him less toxic to play against or more true to his original identity / being more skill expressive.