Top Gear is primarily about entertainment.
It is not a 'serious' program about cars.
With the present day dumbed down society any serious program would only last a week.
That is not to say that Clarkson and the others do not know about cars, they are all very good drivers and experts in their field.
As to the time trials, I would be much happier if it had an official timekeeper who was not answerable to viewing figures.
Without such credibility it just becomes another part of the American 'Dream' culture, an illusion.
I actualy believe that Clarkson would prefer a better regulated and technical show to reflect its British origins.
Unfortunately he is controlled by the system as it is.