What an interesting thread!
As an Arkansas native, I suppose mine tends toward a southern accent, but I have been told that mine is less so than most.
I find many different accents to be attractive, and some to be a bit humorous, and some downright abrasive; but often, it depends upon the speaker, and his own variation. For a total-immersion cinema experience, and also a darkly hilarious movie, check out "Fargo." Some truly excellent Minnesota work there.
Just as a personal observation, the worldwide accents I have heard seem to follow a trend - in general, the colder climates tend to produce harsher, more gutteral vocal trends, and warmer climates tend to produce lighter, more lyrical sounds. Any comments?
And my final note - the hillbilly accents, especially from the Ozarks and to some degree from the Appalachians, seem to get the most negative responses from people of other areas in this country. The interesting part is that these dialects appear to be the last remaining vestiges of the English language from the Shakespearean era. Creature=critter, victuals (food)=vittles, the list goes on... these pronunciations were common, proper, and accepted in London at the time.