You can get calcium and protein from better sources. Milk is high in carbohydrates - so low carb alternatives like nuts and green leafy vegetables represent a better alternative.
Info here: http://atkins.com/Ar.../15-147160.html
You'll notice there is no mammal out there that consumes milk past the nurturing stage of the mother - except for us humans.
I never drink milk. Soy milk represents the better alternative - and you get used to and even enjoy the taste after a while. I have it in my tea and coffee.
Wait... carbohydrates = bad? You need to substantiate that statement. Also, lactose is not high glycemic. Even if it were, 12 g is not many carbs at all. Lactose intolerance can be easily resolved with lactose free milk.
I do not think soy milk is better than milk. They both have positives and negatives but are two different foods that do two different things. Milk contains all sorts of bioactive constituents that are good for the immune system, prevent hypertension, and aid in cancer prevention, among many others. Also milk protein is among the best in quality, and is slow digesting. The emphasis on calcium is very misguided, that is not the only reason milk is good for you - far from it. However, calcium content is not the only thing that matters, but bioavailability as well, and the calcium from milk is very bioavailable.
BTW, take a look at the references on the articles at the Atkin's site - almost none of the journals are peer reviewed, about half of them are obsolete, and the studies are often misquoted.