I think the idea is to produce an entertaining car-based program, rather than a realistic car program. If you like dicking around with cars, watch Top Gear, if you want to know about a car before you buy it, watch Fifth Gear. It's a bit annoying when people pick holes in Top Gear... just watch it and enjoy it and laugh at it, rather than going 'Ehh, they set that up', it doesn't matter, the end result is the same: it's funny!