The best known cheeses in the US aren't very good. For example, little kids really like "American Cheese," which is bright orange and comes in little plastic packets- it's not a good example of cheese. Cheddar is another American favorite, and it's a little better than "American Cheese".
A lot of the real cheese Americans eat comes from Europe- France or Italy. You can't really tell how good a cheese is by the way it looks, but cheese that comes in wedges (part of a circle) is usually better than the slices.