Whether it's a Butterfinger bar or Hershey's milk chocolate, is it good for you? For the most part, no. Highly processed bars typically contain a lot of sugar and very little cocoa content. Though a higher quality bar of milk chocolate which contains more cocoa is an excellent antioxidant source. Though dark chocolate is the winner for nutrition.
ORAC Source
USDA Database for the Oxygen Radical Absorbance Capacity (ORAC) of Selected Foods, Release 2 - Prepared by Nutrient Data Laboratory, Beltsville Human Nutrition Research Center (BHNRC), Agricultural Research Service (ARS), U.S. Department of Agriculture (USDA) - May 2010