Come on now, if you guys take this classing of cars seriously, I would think you guys would want to class them as fairly as possible. This would mean you would want to take a critical look at the car as a whole. With the interweb, this is not a very hard job today.

Otherwise, the process just looks like a random number generator to people like me looking in from the outside. :P
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But the big distinction is that just because we KNOW the differences, doesn't mean we can accuratly apply weight 'penalities' to every little advantage and disadvantage. As soon as you drill down any more than we do now, its all even more of a guess than what we do now. It's an estimation that is seeminly working out well but to dice it up even further, it would be a mistake.