Why do people complain about Malzahar?

Not in the sense of "I live under a rock and I don't know what people are complaining about". More like did we all forget that Malzahar's game play before the rework was almost less interactive than a Soraka lane?

I think a better way to frame the question would be "Do people not remember why Malzahar was a candidate to be reworked in the first place?" I don't think auto-farming from the FoW with a jumping DoT is the epitome of LoL's expert champion design. More like the prime example of its rock bottom. Champs in general are moving to be more interactive with opponents. Same needed to be done with Malzahar, but Riot thought they could preserve his kit's old feel while making him interact more, hence the spell-shield passive. Big mistake.

I don't think a revert is a good idea. His kit just needs major changes.