It's still too early to tell.
It's hard when there's no cohesion and fit for the team. But I think he's doing an okay job. Of all our loses outside of Milwaukee which was a total wreck, we we're within striking distance, despite the lack of elite talent and cohesion. I know moral victory gives you nothing, but IMO it tells a little bit of progress.
The fact that he benched Jeff for lack of effort impressed me. That shows a bit of coaching dominance. If you're not playing hard on the court, you sit down, no matter who you are. That, tells something.
Can't give a full assessment yet. This roster isn't helping much, but his claim to fame seems to be how he can make something out of nothing. We just have more "nothing" and it's at the NBA level.
Bass, Lee, Faverani and Crawford to some extent are playing good compare to last year's performance (sans Fav) so I guess he's making something. I think the "something out of nothing" is slowly working. Olynyk is not on par with his SL performance offensively but we're now seeing how he plays solid defense, in which he's not really known for coming out. Sully showing some range with his jumper and Avery having confidence in his jump shots despite missing a lot of it (although he started making it during the Memphis game). There's still more work I know, but little by little we see player development.
Let's remember too, Brad did something out of nothing in Butler, but those "nothing" played their roles perfectly. Our team is a mess. We have no PG and our rotations are still on process of figuring out. Let's give it time.