Seems you don't know anything about beef if you are talking about Kobe beef. It's just like Bordeaux Wine, it's beef from a certain region ... it says nothing about quality. Try Miyazaki Beef next time you are in Japan ... http://www.rareedibles.com/miyazaki-beef/

Then we can talk. It depends on how you define best. Honestly, Japan has on average the best food, the maximum too (see michelin star restaurants). Average food in US sucks (I think you mean US when talking about America...).