I can't say it's better than Swiss or than Cadbury chocolate, but it's not worse either! It's just a different experience!
...I like the "rugged" and slightly "sour-ish" taste of Hershey's and that fact that it actually fills your mouth with a strong flavor. And that it doesn't just melt instantly in your mouth, but you can actually chew it. And that it doesn't feel like "50% sugar": to me all European chocolates are just too fucking sweet, except for the dark chocolates. But I like milk chocolate that is not so fucking sweet and doesn't just fucking melts in your mouth before you even had the chance to taste it, and the extremely subtle yogurt-ish flavor of the Hershey added on top just makes it perfect to me. Cadbury too has some of these attributes but the Swiss brands taste just wrong to me.
Even if it was a historical accident, to me Europe just misunderstood chocolate (except for the dark high cocoa chocolates that they did get right), and I really hate it that Hershey's is so hard to find in Europe.