The funny thing is that, despite being the most famous of our many local chocolatiers, it's probably the worst among them. Hershey became big by finding a cheaper way to make chocolate, namely taking old spoiled milk back from dairies, and then adding so damn much sugar to it, to tip the sour/sweet scale. It has a unique sour aftertaste that many have come to love, no other chocolate is quite like it there, but give it to any Swiss or German and they almost immediately spit it out!
Another local company, Ashers Chocolates, makes world-class dark chocolate that I'd put up against even Lindt from Switzerland. But they've never gone national, as far as I know, they only sell regionally.
I grew up on Hershey, so I still appreciate it, especially breaking off half of their traditional 16-square bar to make S'mores.