Detroit, São Paulo and Los Angeles are not even ugly. São Paulo and L.A. are just crowded
There are lots of other cities that are uglies than SP, L.A., Detroit and Mexico City for example
Obviously, other than hype, Paris should not be on this list. It is hyped to be beautiful, but really isn't. Florence and Venice should be 1 and 2 respectfully. There is this hill where you can oversee all of Florence which is just beautiful. So is the cathedral there as well.