The thing about milk is that it varies from dairy to dairy, and from source to source. Grocery store milk usually tastes pretty awfully, especially their skim (which I usually) drink, however, I've found that convenient store milk tends to taste better, especially if the chain gets their milk directly from farms. There's a chain of convenient stores East Tennessee called Weigel's (think Circle K, only with a W) that's actually operated by farm, so the milk on their shelves comes straight from the Weigel's dairy farm.
My mom has gotten addicted to a VERY local (as in only in this town) little farm that sells their milk at a rinky-dinky little farmer's market in the city, because the girls who run the farm do very little to their milk from the time they milk the cows to the time it's delivered to the store... heck, when you buy a gallon of their milk, cream floats up to the top. I blame that milk as a contributing factor as to how I blew back up (took me SEVEN YEARS to drop ONE size, and now my clothes are fitting tightly again).