[thaumasiotes]

Well, I can't dispute the claim that Chinese Pizza Huts are disgusting to Americans and Chinese Papa John'ses aren't; that's pretty much how I feel about them.

Pizza Hut's success isn't necessarily down to adapting its pizzas, though. They do two other things differently: the Pizza Hut menu includes chinese dishes like fried rice, and their branding/decor is super-fancy, whereas the decor at Papa John's says "pizza place".

Also, Papa John's isn't exactly hard to find (in Shanghai, anyway). It's one of a few joints (like Ajisen and KFC) that I think of as ubiquitous.