My Mum did everything for me. I can't ever remember having to make my own bed - even when I still lived at home at the age of 16!
My son is also a complete (in the words of Ummmm) pig, and if it were left to him, then his bedroom would be a complete state.
I'm actually in the progress of decorating it right now (I'm typing this covered in white paint) and I've just taken his bed part and found numerous stinky socks underneath it, wrappers and, disgustingly, half a sandwich - despite me telling him not to take food up there.
I did try to get him to tidy it himself, but he just kicks it all under the bed, or under the wardrobe, so I end up doing it myself.
He does, however, now make his own bed (woo hoo!) so I can't moan too much. He's 11, going on 15...
I would say you are right. I couldn't live in a house knowing there was a room like a pit upstairs. I do completely understand people that do just that though - close the door and let them get on with it, but I just couldn't. Call it OCD if you like :)