America is exceptional by every definition of the word.Lol. American exceptionalism. It's another name for American parochialism...
No other country on earth is quite like it, not even close.
Is America the best country in the world, maybe-maybe not. Being exceptional doesn't mean your are the best - it just means you are very good in ways that are very different than others.
Does it mean there is nothing wrong with/in America. Of course not. There never has been or will ever be a perfect nation.