Any takers? I'll start. South Korea.
Worst country? Turkey. Why: Male chauvinism really, really bad. Pushy salesmen/ waiters. We were scammed even at Burger King (never experienced anything like that before). The tourist places suck, but people tell me that people in the countryside are nice.
CD
Ps. Have travelled in southern part of Africa, most of europe (even eastern europe), Boston/ LA/ San Fransisco in the US, Britain, Scandinavia etc...