I'm not a big fan of the Chris Evans broadcast persona, to the extent that I'll generally switch channels if I hear or see him. That said, I am told by people that know him that his off air persona is very different. I guess the same is true of Clarkson.
So while I wont go out of my way to watch TG (it's something I'll stumble on when there isn't anything better to watch and I haven't got anything better to do) and haven't for a long time, I'll be interested to watch one episode to see how it goes.