I was following a regular mk7 in silver for about 20 minutes earlier today. It looked good. Especially from a slight angle from the rear. Silver is not a colour that I think suits the GTI but the light colour and the reflections really showed off the shape of the car and the details like the creases.
A while later I followed a rather dirty regular mk7 in black around a roundabout. Looked awful. Yet a black GTI I think looks pretty good!

I think a lot of it might come down to the fact it looked like it had been a month without a wash.