It’s not as trustworthy as it could be. Are you using the term as commonly known?
https://en.wikipedia.org/wiki/American_exceptionalism
Seymour Martin Lipset, a prominent American political scientist and sociologist, argues that the United States is exceptional in that it started from a revolutionary event. He therefore traces the origins of American exceptionalism to the American Revolution, from which the U.S. emerged as "the first new nation" with a distinct ideology, and having a unique mission to transform the world. This ideology, which Lipset calls "Americanism" but is often also referred to as "American exceptionalism", is based on liberty, individualism, republicanism, democracy, meritocracy, and laissez-faire economics; these principles are sometimes collectively referred to as "American exceptionalism".
As a term in political science, American exceptionalism refers to the United States' status as a global outlier both in good and bad ways. Critics of the concept say that the idea of American exceptionalism suggests that the U.S. is better than other countries, has a superior culture, or has a unique mission to transform the planet and its inhabitants.
Like, when I consider the Tuskegee Syphilis Experiments or MK Ultra, or Flock, I have bad things to say about them but American exceptionalism specifically wouldn’t cross my mind. Corporations anywhere playing a card close to the chest or even lying… superiority, exceptionalism, aren’t my top reference points.