There are thousands of aspects to a cars design that can be executed half-assed/cheap or to perfection. Everything from the feel of the switches/dials to the sound a door makes when it closes, pedal feel, steering wheel feedback, infinite handling characteristics (turn in, bump steer, steering ratios, weight distribution, chassis dimensions/track/wheelbase, etc) um - literally a thousand things, sound insulation, how much noise the HVAC system makes at full blast.

This is why people shell out money for luxury cars - and yes I drive a mustang, no I'm not claiming it does many of the above things well (actually their interior/handling characteristics have improved exponentially lately, especially with the 5.0 - I've owned an M3, and have a land rover daily driver, so I'm speaking from experience) So anyways, for people who spend 99% of the time using the car for normal shit, and 1% trying to race people - everything I mentioned above will give you a more rewarding car.