That's about as far as I got. He seems to have been a good producer as evidenced by Morning Joe and its predecessor and his work with Colbert. That doesn't necessary translate to head of a company.
My feeling is there are too many chiefs in the CNN/Warner corporate structure and not enough competent middle management folks. The other problems arise when news operations are expected to be a profit center.
The hay days of news operations like CBS, NBC ABC were when they weren't expected to be profit centers. I'm also not sure CNN can ever get back to their "hay days' when they were owned by Ted Turner, then they were basically the only game in town. Like most media, those days are long gone.