That's because Clarkson has no imagination or originality. Turn him sideways and he vanishes - totally 2-dimensional.
IMHO TG has utterly destroyed any hope of there ever being a decently informative motoring programme on mainstream TV again. The "Used Car Roadshow" is narrowly informative....may be OK if you ARE looking to buy a car of the type they are showing, but otherwise...? Fifth Gear? Gone downhill rapidly....I'm not interested in whether a Lambo is a better car than a Porsche....
Regardless of any initial intent on the part of other programme makers, they all end up making TG clones for the ratings, and they therefore get the same audience - "blokes". Plus an occasional "lad" who will grow up to be a "bloke".
Dammit, we "chaps" want a look in!