Not all American pizza is fast-food-chain. Some of it is mightily good, though rarely very Italian. But I've never had any pizza in England (never tried it in Scotland) that didn't fit the description I gave.

A man from London, on his first trip to the US, was taken by friends of mine to their local pizza parlor (a place I've also been to). Remembering English pizza and thus skeptical at first (I doubt he'd been to Italy), he was converted by the first bite. I believe that words on the order of "nectar of the gods" were uttered.