While I agree with the heart of your point, it's worth mentioning that many restaurants in China adhere to impeccable sanitation standards. Furthermore, it's possible to get high quality sushi in both BJ and SH; even the tiny place in my BJ apartment complex received air shipments from Tsukiji 3 times per week, which puts it a notch above every Japanese restaurant in Portland (except for the place in the airport).... and it is/was mid market.

Oysters are a notable exception to the above (at least for me). I've been burned by the Sheraton in HK, the ANA hotel in Hiroshima, the Shangri-la in Manila, and the Portman in SH (which paid for my medical bills and hooked me up with a free brunch; kudos to them!). Now, I only eat oysters from large volume purchasers like Legal Sea Foods and M&S.

With regard to the all-you-can eat sushi joints in BJ and SH, I'll be the first to admit that some (if not most) of them are dicey, but there are some good ones (just don't eat the Uni).