@hingehead,
Very interesting topic.
I don't think I've ever had as good Chinese food anywhere else as I have had here in the US, but I can't say that everywhere I go, I eat Chinese, but I did in Australia and I maintain my claim.
The Indian food in the UK (specifically London) is far better than what we, generally, can get here, but I did eat at a place in Toronto that rivaled London's Curry Shops, and there a couple of holes in the wall in NYC that are very good.
The tapas I've had, outside of Spain can't compare with those within, but again, I don't think I've sampled them enough in either the US or elsewhere to say who does it best outside of Spain.
Lastly, I've had better French food in the US than in France.
On the flip side, attempts at "American" food in other lands is usually laughable, since it seems that these places all assume that American Food = Steak & Burgers. Since they all overcook the beef it's ridiculous.
I have heard of, but not yet tried, a place in London that serves their version of BBQ which is supposed to be pretty good. The problem is that I don't want to eat at "American" restaurants in foreign lands, and only do so when my hosts feel like it will make me feel at home.