A buddy of mine had a tricked out gtir swaped b13 sentra with a stillen body kit that was painted flat white. It was a really nice looking tuner car, but it wasn't built for show. (gutted interior)

Matte finishes can look really nice on the right car.

 

Matte finish (like on the bmw) looks better than flat (like on the three maximas).
Flat looks too much like primer

 

That lambo with the matt black is ridiculous.... the m3 looks awesome too.