Still can't figure out if Dornish wine is supposed to be good or bad.
I think generally speaking, Dornish is shorthand for strong red wine, and Arbor (which is part of The Reach) is good, white wine. Arbor Gold is for refined people who have their shit together, Dornish Red is for dangerous people and/or proper alcoholics.
[EDIT: after looking it up, there seems to be plenty of reference to Arbor Red, too... like the Arbor Gold, it's considered really really good wine. For show purposes, Cercei and Tyrion are probably prime examples of people who prefer Dornish Red.]
And practical people, like those in the north, drink beer instead. As do the smallfolk. In fact, Commander Mormont at one point has beer with his breakfast (both in the book and in the show).
And in Essos, they have their own wines and stuff. I think the Dothraki drink fermented horse milk or some such. I think Qarth also drinks some crazy shit. There is occasionally mention of imported Westerosi wines, though.