I never look down on anyone for an accent - our local one does make the speaker sond somewhat lacking in intelligence, but of course, that is never an indication.
Sadly, perceptions of accents can lead to people assuming lower intellect - especially for Brummies and West Midlanders, and for West Country people as well.
On the subject, I find some accents really sexy - Cheryl Cole's Geordie accent is wonderful - as is any Welsh accent - except Sian Lloyd. Not at all keen on Estury accents - or the Stoke accent, although I am surrounded by it. I don't have it myself, no idea why not.