I hate them, because it's way too easy to get finger smudges on them unless you JUST washed your hands with soap, I much rather have the back manuals be any color other than black, that way the smudges don't show like a pimple on prom night.
Even worst is when you get a game and somebody else smudged it like hell. That's pretty disgusting.
Everytime I handle the back of a black manual I do so carefully, but no doubt a smudge always ends up on it and I go "damn you..." :P