Negativity is also a cancer. There's a lot of great things about America, and a lot of great people. If the bad parts are stopping you from appreciating the good, the that reflects more on you than it does on the country or the people who live here.
The US is 1.867% of the world's landmass, ignore Antarctica and you still have 95% of the world to see. It's a young country so the density of historically significant things even in major cities is pretty low compared to Europe and a lot of urban development is in fact suburbs (so roads and outlets and big stores). It's big so it's varied but take the same size of territory and check what you get anywhere else and it's the same thing... Heck, culturally speaking you'll have more variety over a much smaller territory in most of the world because countries are smaller...
I made the decision to not go to the USA anymore after 2016 and don't miss it one bit, plenty of awesome stuff to see elsewhere...