We're great in some things and just awful in others. I can go beyond a simpleton black and white thought process.
You seem confused. It's not American Perfection - it's American Exceptionalism. It's the view that, taken as a whole, the good and the bad, we're the best. It doesn't mean you don't think America can be improved.
You don't get to build your own country. So I'll ask again, on the whole, can you think of any country that's not as good as America?