Basically this. ^^^
Some of Vivek's challenges have been unavoidable. The revenue sharing is a huge one, and to have to navigate that in a small market with a non-playoff team just really put him behind the 8-ball. And full, 100% credit for being there to get the arena done and committing to staying in Sacramento for three decades at least (was it 30 or 35 years?)
Still, some of the issues have been self-inflicted, including Matina, and largely seem to stem from not knowing how to run a basketball franchise but insisting on having too many fingers in the sports end of it. There's a large percentage of sports ownership that is essentially a vanity venture for the über-rich, and having met Vivek very briefly, I get the distinct impression that vanity is a major motivating factor here. Ideally that should work out fine if it's just being the public face, but Vivek being actually very smart and having accomplished a lot of what he did via his own work I think he felt he could just step into a completely different field and hit the ground running as a basketball decision maker. That's on him, so it's hard for me to give him a "C". I think the grade has to be worse than that, but I'm willing to go with the "INC" as it seems that lately he has been stepping back and letting the front office do its work (and yes, that applies even before the McNair hire). So, he's been bad but I have reason to hope that he's trending in the right direction.