Christopher Hitchens seems like a skilled speaker to me. I get the impression that he is familiar with rhetoric techniques and how to use them.
However, I think, his message and his delivery do not match. It seems to me, especially after watching the longer version of this video, that he takes the side of a strictly scientifically based viewpoint on the universe, “god” and such issues; at the same time I’d call his behaviour rather unscientific. Instead of just presenting evidence, he more than once uses a populist rhetoric, is sloppy with his argumentations, and makes assumptions which he presents as his opponent’s. In my book, this is less than scientific.
I don’t neccessarily disagree with his viewpoint, yet the content and the form of his speech do not match.