I think it really depends what your after... if your after a stright up car review program, then 5th Gear seems to be the go (aside from the female presenter
), but if you've after some car eye candy, a eargasm from the car soundtracks and some enjoyable banter between the lads, then Top Gear ftw.
And Clarkson has never pretended to know about how cars work and the technical aspects. In most cases when he starts talking about the techical aspects of cars he just takes the piss out of himself and talks about the 'bi-turbo black magic'.
The one segment I DON'T like on Top Gear is the 'Star in a Reasonably Priced Car' segment. I always FF through that unless it's like an F1 driver or say Guy Ritchie, Vinnie Jones, etc.