I agree with what Chubbs and Funky said.
Corbin isn't an upgrade - certainly not defensively. His defense leaves a lot to be desired (in fact, his Jazz team was pretty bad defensively) - thankfully DMC keeps trying to hold teammates accountable. Thus far, his only true upgrade has been getting more minutes out of the starters, which, I give him credit for recognizing that the bench can't be left to fend for itself.
That said, I understand Corbin is in a no-win situation. He has to replace a popular coach (both by fans and players), and he has to install an offense that seems to be counterintuitive to what makes this team successful. (Notice a theme in the Kings' past two wins? Notice DMC calling out the defensive effort after every loss?)
I can't imagine what kind of conversations have happened after each win. Is the FO giving him an "atta boy!", or are they saying, "hey...what about running a bit more? I mean, we won, right? So let's [finger quotes] add on [/finger quotes] to what we're doing, Ty. OK?"
I've said it before, I'll say it again. Corbin gets a pass from me because of what the FO has done. If he can get the players from falling apart, then he should be commended and may be rewarded with a job somewhere else next year. I don't think it will be here - the FO has likely intimated as much.