I will not presume to speak for the other Asian ethnicities, but I can usually judge a good Chinese joint when I see one. Is the place:
Full of Chinese people? Good.
Full of old Chinese people? Better.
Old Chinese people gambling, drinking, and yelling? Even better.
As for a litmus test dish, simple stir-fried greens with garlic will indicate skill in the kitchen - pea shoots (do miao), yam leaves (fan shu ye) or water spinach (kong xin cai). Are the greens tender crisp, lightly sauced with cornstarch, with a nice blast of wok hei? If so, the kitchen knows what they're doing.