yeah, the metallic i think looks best on white where you cant see those individual granules too well, but it enhances the reflectivity of the white paint. Similarly, i think the lighter the color, the better metallic paint looks.
I saw this dark red escalade the other day which had the metallic granules which glared out pink. Bright graphics complemented with ugly 24' spinners.
So along with my distaste for dubs, bright graphics, nasty wings...etc... metallic paint is becoming a turn off.
I respect others indivdual tastes, but beauty has its limits.