Simply stated. He is over nerfed. And can't compete as other AD champs outscale him when they get criticals.
With a nerfed AA range, and nerfed mobility and no escapes.
His shield was intended to help with CC, but they nerfed that too.
So, basically... everything you gave Malzahar in the rework, you have taken back and taken away his ultimatates scaling, his ability to tank dragon, his ability to jungle.
So the hell with it.
He's not competitive anymore.
Thanks for nothing.