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As an American, I agree with you 100%. Our opinions on taste are utterly worthless.
It's not just Hershey's chocolate either (which is already bad enough), it's so many other foods that are commonplace here. Food quality in this country is abysmal. You can get great food here, but it's harder to find and you'll pay dearly for it, but the stuff that regular Americans eat is generally awful.
Hershey's chocolate breaks that rule and contains butryic acid. Here's a link explaining why and how that affects the taste: https://www.chemistryworld.com/podcasts/butyric-acid/1017662...
EDIT: To be fair I think the butryric acid thing can be overlooked as an acquired taste. Same way that IRN BRU tastes like bubblegum to Americans, even though UK'ers claim it isn't. I still think Hershey's regular milk chocolate works better with peanut butter than any other chocolate I've had. The bigger issues I have with Hershey are the cloying amounts of sugar they keep adding as they knock down the cocoa butter and cacao solids in each of their products to save money. I used to run boxes of UK KitKats down from Canada's duty free stores so that other Americans could see what they were missing out on.
You can add American's functional properties to almost any cheese with sodium citrate powder (we make and slice up baking sheets worth of "Americanized" aged cheddars, gruyere, and even blue).
I would not confuse these useful properties with goodness. Grapeseed oil is also extremely useful. But California olive oil is a better oil. American cheese is like the grapeseed of cheese.
Huh? On non-fast-food cheeseburgers, cheddar is typically the standard cheese, and swiss is also popular. One of the best burgers I ever ate had caramelized goat cheese (in Europe). I don't even know the last time I had American cheese (on a burger or anything else), and I'm pretty sure the cheeses I've had on burgers were not "Americanized" as you mention, they were just normal cheese.
There is a reason that the nationally-famous burgers at Au Cheval in Chicago, Hog & Hominy in Memphis, Holeman & Fitch in Atlanta, Shake Shack in NYC, Husk in Charleston, and probably a bunch of other destination burgers all use American, despite many of these places being sit-down establishments.
If you're looking for something to serve an almost functional role in a product, like a S'more or whatever, it's... fine? Do you bake with Hershey's? Like in a brownie, where you can dial the sweetness in instead of swinging it all the way to 11?
I don't think there's anything wrong with liking Hershey's chocolate, and I myself like American cheese! I'm just saying they're objectively not as good as other products, and the people who point that out aren't wrong to do so. Honestly, I think most people who say Hershey's is good would prefer Cadbury's.