@Meddler Context on the Mord changes?
http://www.surrenderat20.net/2015/12/1210-pbe-update.html
Mordekaiser Iron Man (Passive) Shield decay per second reduced to 1.5% from 2% Siphon of Destruction (E) damage increased to 45/75/105/135/165 from 35/65/95/125/155 Children of the Graves (R) ghost now gains (100% of Mordekaiser's bonus AD) attack damage instead of flat 10/25/50
I think the passive change was a step in the right direction, even if it's a little small to start with. The E base damage is a little random, but acceptable.
What confuses me is the ultimate change; this is entirely out of the blue. Are you trying to encourage AD Mordekaiser? Why is his AP-tank build not approved of, and will there be further changes that make his AD playstyle the superior one, even if he lacks the incentive of itemization for it as opposed to what items like Rylai offer?
Further, do you plan on addressing the most complained-about gripes, namely his abysmal base stats and the current state of Harvesters of Sorrow?