This doesn't sound like good news... Glad I went with white!
Sounds like expected news honestly. I prefer black (and I prefer black framing my screen) so I picked black, but in my experience anodized aluminum the color rubs off, especially on corners, and there's not much you can do about. Regular wear and tear.
I personally liked the glass backs people gave Apple crap over. As long as you were careful and maybe put a cheap case on it, they weren't that bad (and supposedly easily replaceable if you did shatter them, I wouldn't know, I never did. And I'm not the poster girl for some one who never drops her phone, it is a gaurantee that something small like that that I pick up a lot will inevitably get dropped some). And they didn't scratch or crack (long as you were careful, unlike the plastic Apple uses that cracks no matter how careful you are).
Honestly, I wonder why not go to something like carbon fiber (ok, so I'm not an engineer so I don't know if that would actually be a bad idea, I know carbon fiber is weak in some regard but I forget what)? Is it just more expensive (or I guess in Apple's case maybe too thick).