pjw, I realize I'm commenting among the heavyweights here, once frogman joined in. But I'm a big fan of Brubeck individually, many of his quartets, and particularly when accompanied by Morello.
In fact I've posted "Castilian Drums" here previously. I respect many other jazz drummers but if picking a single favorite to listen to it would be Morello. His rhythm is relentless and impeccable, as frog pointed out. But for me it is also his melodic and creative playing. There is continual inventiveness, not repeated and boring.
Being a Brubeck fan for decades I've thought about the controversies of his popularity. No doubt some of that is the "white factor" frog suggested. But I believe the biggest issue was his popularity itself. I think possibly some other jazz musicians resented his success in record sales and concert attendance. And some jazz fans felt he couldn't be that great when he was acknowledged by non-jazz fans. From both sides, he was so "in" he was "out"!

