He did a horrible job when he had KG, but his last couple years he's been OK, I think. I mean, that was the best package he could have gotten (where are all the people railing on him for not taking Chicago's package of Ty Thomas and Lu Deng at al now?). He was a little late doing it, but even so, he's got some good young pieces now. His biggest mistake of the last few years was Foye/Roy -- you throw Roy in there with Al, Miller, Love...then you've got something. Foye just isn't that good.
As for him coaching...this is just the last stop on his way out of town.