He was an all-time great at his peak, but unfortunately the quality of his recent work falls far short of what he's capable of.
He's become more interested in trying to be a philosopher instead of a comedian. His long setups don't really go anywhere comedically, he just wants to make a point. The problem with that, is that he's not saying anything particularly interesting, so it results in a meandering, uninspired and bland hour.
It was a hell of lot better than the latest Ricky Gervais special though, I'll give it that.