Rough coated dogs are scruffy and smelly lol, although it must be said, on occasion smooth coated dogs can also be smelly . Seriously though, the worst coats I've personally seen, poor, thin, not cold or water resisant, have been bedlington x's. I know some people will obviously say different, NL , but I'm saying personally.
My lad's rough coated dog, with beardie in, has probably the most water and weather resistant coat I've seen on a dog, and will happily spend a couple of hours in wind and rain gnawing at a bone, when he only has to get up and move three or four yards to be inside!