Sounds like some people are comparing it to joe blog in the street, which is not what it's about! I'm guessing you would be complaining about the same things when he did the E-Type like "I haven't 90 grand to spend on that, why cant he pick a normal thing blah blah blah".
It's a program that's not trying to be too in depth or boring, while at the same time being different to your typical vehicle show. That's why it sells, and should remain like this I say!
If you want ultra realistic things, then I suggest you just start watching Wrecks to Riches (also interesting, but seems a bit silly at times). Otherwise stick to the comics.