The one in Porter by Big Lots, Goodwill, etc was decent last time we went which was quite some time ago. Decent...don't know if it rates good.
@sh56: I don't know of any "good" Chinese buffet, for starters, and one with sushi sitting out would be worrisome. The only way I would be interested in sushi is made-to-order fresh.
Ginger Cafe is awesome, serves sushi, but not buffet.
Red Curry is another great choice, also not a buffet.
Grand Garden is great as well. 4951