See now this is interesting because it depends what you're doing with it.
A mini cooper is tremendous for small, not necessarily blisteringly fast journeys.
The main reason I love the Mustang in DCS so much is that it's fun to fly for long journeys, you can cruise, the visibility is great and once you're trimmed out you can think about carb heat and radiator position at your leisure.
My main worry about the Spitfire (in general really) is that I might not enjoy it the same way. The Spitfire was designed as a short range combat aircraft, nothing more and certainly nothing less.
A P-51D is like a GT car, it's powerful, fast and actually quite comfortable
Spitfire might be amazing for a 20 minute flight but hell if you have to go long distances?
Not everyone has the same standards when it comes to determining the "quality" of a given aeroplane.