i think mord is fine aside from a few issues
after talking to him on the pbe he thinks that W is hard to make interesting as a spell, because it was basically just a scaling
with added defense boosts and it wasn't really an interactive spell. on PBE the main issue with W is that its "optimal case" bot lane almost DEMANDS your support be tanky initiator in order to get the W's damage to go off. As much as I want it to be self-cast again, it would probably need some sort of negative side-effect in order to keep solo-lane Mordekaiser from being overbearing
as much as i don't like 325 movespeed, it was done around the idea that he should be easy to move around but a threat to engage directly. I think it should at least be upped to 330, but it makes sense from a thematic standpoint
honestly, W is my biggest issue with the rework. people don't realize that aside from that, he's become a LOT more flexible as a champion. He can succeed with AP or AD, he can at least solo lane competently although he's definitely lost some power, and now he's, at the very least, a niche pick for bot lane.
give him some credit -- the rework's only in need of a little bit of tweaking. he did good from a conceptual standpoint, i think it's just the execution that needs a little work.