My skins are slightly shaded. I'm not really a fan of real heavily shaded skins..
I think shading adds depth and I swear, non shaded skins are terrible. Seriously, unless your a newbie at making skins (which I sorta am, but I shade my skins) it is unacceptable to not do one spot of shading. I also notice that those typical stolen teen girl skins with hoodies that everyone posts get way more downloads than carefully crafted, original skins with effort put into them. It seriously makes me want to cry -_-