Absolutely Stratters and LeQ - that is exactly how it is in my house. I have 3 (mid/late) teens and a 3 year old. I honestly never have the need to shout at them aside from the occasional nag about tidying their shit pits etc.
I have never been one to say 'No! No! No!' but at the same time, when they do ask if they can go somewhere or do something and I do say no, they just don't question it. Maybe I have been pretty relaxed and easy with them, but they are polite, well mannered and generally extremely helpful teens.
The girls go out, have fun, get pissed, but they also work extremely hard at school and are wonderful with their little sister. DS is the same, (without the getting trashed bit - yet). He doesn't have the tidiest of rooms, but really? Is it worth fighting over trivial shit like that? I don't think it is.
I think that my more than laid back approach to my teens, coupled with involving them with chores from a very early age, so that it appears the norm, has given us all a nice smooth path through the years. DD3 is being treated in exactly the same way, and with any luck she'll be ok too....She's certainly a feisty child, but I don't need to raise my voice at her. The 'look' does it 