I don't believe there is a right or wrong definition - they are like women beauty and value is purely in the eye of the beholder.
I am more than happy that my car is of classic design but I'm not bothered at all which part of a car park I am herded into, I couldn't give a stuff I'm happy with it and think most of you guys are happy with yours too no matter what torygraph may think.
Doubtless in time the Veyron will be called one - to me it is a very fast slug like object of no desire.