This is so true.
They completely removed the mechanical skill involved in playing him, scrapped AD malz viability.
His skill floor was set way to close to his skill ceiling. However, they've effectively removed his passive now, i wouldn't be surprised if actually removing it hardly touched his win rate now (after the change, i know this post was 6 days ago).
Ironically after a couple of games, i've been playing better. Now that i don't play as overly aggressive, expecting my passive to save me. This is coming from a guy who has over 100k score between my accounts on the champion, from before the rework.
Though having that much experience on the old malzahar, actually gave me incite to something funny. Malzahar has always been able to block spells, when played skillfully. Because where his voidlings spawned depended on the direction you casted his spells, it meant that you could simply store a passive charge, and time a W or Q to block stuff like blitz hooks. (did this more times than i can count having played ADC malz)
Now it's stupid to block spells with his voidlings because they comprise so much of your power, and your spell shield works as an automatic one.