The show is great entertainment which happens to use cars. Clarkson though, while funny, can be overbearingly arrogant. When I saw his incompetence when trying to build the Caterham I was surprised. His criticsm of James May for displaying an ordered competence, was childish.
When he set the caravan on fire (and views in our family vary from deliberate to accidental) the man was completely out of his depth. At that moment his credibility in my eyes, disappeared.