Part of it is the fault of 20th and 21st century architecture, but also big changes in urban design and property development economics happened throughout the 20th century.
I'm pretty on board with the idea that North American urban design and architecture is an abject failure, but lay the blame not so much with the architects but with greater forces of rapid post-war capitalist expansion and Neoliberal capitalist 'optimization'.
NYC is not as nice as Warsaw in a lot of ways, but it's wildly better than most other USA cities.
Postmodern architecture can sometimes be an eyesore, but that’s kind of the point. If you attempt to never offend anyone’s sensibilities you get modern architecture and nothingness. Even if you changed modern architecture to mean art deco or neoclassical you’d get tired of it.
So yeah, you might get things most consider eyesores
https://s.yimg.com/ny/api/res/1.2/f.BSw.Y41JI35DZDLjslHg--/Y...
But if you ask a little kid whether they like that building, they might say yes. So you’ve created something at least someone likes.
I’ll take seeing 10 eyesores and one extraordinary building any day over blandness.
I wish that Atlanta would cover the downtown connector and make the city contiguous.