I personally see scratches/blemishes on white just as much as any other color. Swirls/holograms are a touch harder to see, sure, but a bad finish will still show regardless of color. It just hides dust/light dirt a bit better than most other colors, but they still get off-white and nasty without routine washes. The girlfriends superwhite Camry is in need of a clay/correction soon due to the bonded contaminants showing like crazy, which won't come off with a normal wash. My black cars don't really show those nearly as bad (but does show dust and other stuff more).
A neglected finish will show, regardless of color. White tends to get matte looking and 'Ford Cargo Van' like as it scratches and dulls the clear over time without proper care.
