Current Mordekaiser is very rewarding to learn, but most people have just played a couple of games and inted a bunch. From the outside he looks like a very easy champion but with time spent on him, he is amazing. I got my MMR to d4/d3 in a matter of 30 games on him so far this season.
I have played new Morde on PBE and have 3 complaints about his design.
Ultimate:
Being able to take a jungle champion out of an objective fight for 7 seconds is kinda busted.
Ghosts:
Ghosts being removed completely takes away from Mordekaiser's old identity. Riot has really failed us here.
W:
This ability almost doesn't feel like an ability currently, the values are so weak. It feels like the W belongs on the passive and the passive belongs on the W.
Overall he feels like every other juggernaut/fighter in the game now, but with a niche ult, instead of the unique drain mage he was. Riot has been shoeing champions into a classification like juggernaut/marksman/enchanter and removing the uniqueness of their play style for quite some time now..
Overall, he looks cool; They kept the visual really nice but pretty disappointed with the game play.