No offense, but as someone that actually has lived in both places... you sound as ignorant as Adam and Gary. Not only was pizza perfected in the United States (NY style, Chicago, Hartford Style, St Louis Style, etc), but ~50 million Americans are foreign born. America is literally a food melting pot, and ethnic restaurants are run by... people from that place.
I would suggest not following Gary and Adam's lead by only eating at tourist traps. Enjoy your local tikka, which I'm sure makes you feel like a delegate at the United Nations of food.
I'd love to know where you went that had salad covered 'in sugar'. Dressings are made from oil/vinegar/spices - did you try to order a salad at McDonalds...? or let me guess, you went somewhere classy.... like... Cheesecake Factory...