True, they do not tolerate direct sun. But they certainly can be outdoor plants. Pothos is native to tropical regions of Southeast Asia, specifically Malaysia. If you live in a similar warm (65 to 85F), humid climate, you should have no trouble growing them outdoors. Even where I live I have them outside in pots hanging from/under trees in Summer.
If too much direct sunlight on the leaves and they will gradually become a pale washed out green color. In too little light, the new growth leaves will be very small and the stems thin and weak. If a Pothos receives too little water, the leaves will wilt and become weak. Some of the older leaves will turn bright yellow. If the soil is kept too moist, the roots will rot and cause the leaves to wilt because there is no way for the plant to absorb the moisture in the soil. With overwaterng, the leaves turn a dull, pale color. It takes awhile for this to happen. They are quite forgiving. They prefer water that is not too hard. If you have hard tap water, maybe collect some rain water for them. Note: Pothos LIKE to be quite potbound - 75% roots and 25% soil is fine!