How do you rate these cities?

I have some major cities around the world. How do you rate these cities using the scale of 1 to 10, 10 being the best (skyline & overall development)?

Americas:
Toronto
New York
Chicago
Los Angeles
Mexico City
Sao Paulo
Rio de Janeiro
Buenos Aires
Bogota

Oceania:
Sydney

Asia:
Tokyo
Osaka
Seoul
Beijing
Shanghai
Hong Kong
Singapore
Bangkok
Kuala Lumpur
Jakarta
Manila
New Dehli
Calcutta
Bombay
Karachi
Tehran
Dubai
Riyadh
Tel Aviv

Europe:
Moscow
Frankfurt
Prague
Zurich
Paris
Athens
Istanbul
Amsterdam
London
Madrid
Rome

Africa:
Cairo
Lagos
Johannesburg>