Since when has anyone tuned into Top Gear believing it is a car show? It's just a bit of a laugh and tomfoolery that's all and doesn't pretend to be otherwise, so criticising it for not being a car show is like criticising rugby for not being football.
Top Gear is just a bit of light entertainment on an otherwise boring Sunday night if you don't like it then I would suggest you don't watch it, maybe watch songs of praise instead or something..
Of course there is always Fifth Gear if you want to watch a car show...