Ult seems pretty much useless, since it doesn't help him push anymore, and he doesn't get drag anymore for help pushing lanes. Also it is NOT Morde-esque, it is a cowardly move to single someone out, Morde is known for being in the middle of HUGE fights surrounded by enemies. It would've been better if he at LEAST gained small permanent stats from killing the enemy, but still the thematic is wrong for him, even Swain R is more fitting for Morde.
Passive is basically his W with self movespeed buff instead, which is cool and was definitely needed, but now you have to double tap W to heal? His passive shielding was a VERY unique form of his tankiness, and now it is gone. I'm fine having it transform shielding into health, but the shield should still be passive imo. And unless you exit combat the Heal is useless.
IF Q still hits super hard, then Q and Passive are the only good parts of his kit that actually speak Morde.
Overall I just don't see where they are trying to put Morde. You can probably just roam around and watch him struggle to clear waves with only Q and E now, instead of being a God at clearing waves.