Personally, I love scarves. But I want them big. I'm not a fan of Burberrys' long über-thin scarves F/W 05 RTW. Looks more like a rope if you ask me..
I agree, they're not very functional, especially if it's actually COLD. I quite like big scarves, like chunky knit scarves or a brilliant big woolen tartan scarf... and this type of scarf does seem to be more predominent this autumn. also fairisle patterned scarves seem to be popular.
since there's no scarf-worthy weather here, I have no preference over thin or thick ones. I do like the thick ones to be chunky and waaaaay long. There was this look a while back with the skinny scarf all shiny/with beads/sorta metallic over dressy tops or shirts for evening; I quite liked that.