Once you have tasted a real Italian pizza, you'll never eat one of those Americanised English ones ever again.
You think the pizza you get over there is like the pizza you get here? They may be trying to imitate the style of a NY style pizza, but last time I was there, they still hadn't got it right (given that almost 15 years ago, but even then they had plenty of time to get it right). NY style pizza, which is mostly what people think of when they think of American-style pizza, is quite different from something you'd pick up in Naples or Rome, but it's fuckin delicious and stands on its own merits.
Plus there's New Haven-style pizza, which is considered by some to be the best in the world, and Boston style pizza-- both of which are closer to the original Italian than NY-style pizza. Then there's Philly and Trenton-style tomato pie, and Chicago-style pizza (which actually has a thin-crust variety particular to the area as well), St. Louis-style, Old Forge style. You get the point. And it's not like the kind of pizza you'd get in Italy is totally unavailable here, either.
So do me a favor, until you've been to Santarpio's or Pizzeria Regina in Boston, Sally's, Bar or Pepe's in New Haven, Borda's or Uncle Oogies in Philly, Joe's in Trenton, Connie's in Chicago, or Lombardi's in NYC, please don't dis "Americanized" pizza again.