The real problem with the Mordekaiser rework
There are a lot of things that I don't like about the Mordekaiser rework. I don't like how the third Q proc hits like a truck but is very hard to land (making him very binary in terms of success/failure). I don't like the weird way he gains experience (due to W). And so on. However, the real problem with the Mordekaiser rework is bigger than any issue with tuning numbers, or even with his kit in general.
The problem is simply that the rework is a giant "screw you" to most current Mordekaiser mains. Mordekaiser is traditionally played as a solo laner, and with the W rework, that is almost not even an option. It would be one thing if the rework said, "Mordekaiser is now best in a duo lane, but can still be played in a solo lane if you really want to." Instead, it's "Mordekaiser has one less ability in a 1v1, so you'd better keep a friend handy."
I have a lot of problems with the rework, but honestly the situation would be a lot better if this was a new champion we were talking about, rather than a rework.