I've always considered Putien to be the most consistently good restaurant in Singapore. Although it uses a central kitchen for pre-prepared dishes, the ingredients are clean, the cooking methods are simple, and the taste is acceptable.
The cold dishes (four small plates) and the hot dishes (taro and duck, sometimes a bit fishy, depending on luck), braised beef ribs, and crispy chicken are all quite presentable. The homemade tofu and silken tofu are good; I've rarely encountered any unpleasant bean product taste. Among the vegetarian dishes, the fried eggplant, stir-fried taro, and seaweed sprouts are also excellent. It's also worth mentioning the staple foods: the fried rice noodles, the rice vermicelli, and the soup rice noodles are all delicious.
Of course, there are also some disappointments. Every time I eat razor clams during clam season, there's sand; the conger eels aren't very fatty during clam season; and the fish dishes are generally mediocre.
Overall, finding a reasonably priced Chinese restaurant in Singapore that isn't too heavily seasoned and is unlikely to cause diarrhea is quite difficult. Putien is probably my first choice.