1 - Aeroflot of Russia (worst fleet of airplanes and worst service in the world, at least it is cheap)
2 - Air China of China (dirty seats)
3 - Sempati Airlines of Indonesia (old airplanes, simply a safety hazard)
4 - Mandala Airlines of Indonesia (badly maintained airplanes)
5 - Malaysian Airline Systems of Malaysia (badly trained staff)
6 - Phillipine Airways (the only airline where I have found cockroaches)
7 - Finnair of Finland (ex. air force pilots)
8 - Iberia of Spain (see above)
9 - Alitalia of Italy (smell of old cigarette smoke in cabin)