Herb and Marion Sandlers are philanthrocapitalists (so is Bill Gates for a reference point). And, according to the New York Times, they are not that happy about how nonprofits are being managed.
According to the Sandlers, Human Rights Watch is a nonprofit they believe meets their standards: "It was effective. It didn’t waste money. It issued meticulous reports that tracked its results. And it was run at the time by someone whom the Sandlers trust."
Are these the standards that all philanthropists should hold nonprofits to? That's for each of us to assess, although I would argue they are reasonable enough.