It's not really hard to tell if he's doing a good job, he's clearly not.

Losing nearly half of revenue in only a few months, adding crippling debt payments, stiffing employees on their severance, refusing to pay rent and other services, plus countless other debacles make it clear this is a dysfunctional company. Network effects and resilient architecture can keep a company humming along for some time despite incompetent management, but those resources will get depleted and they are hard to regain.