Some people like milk, others bash it. Fact remains that a LOT and I mean a LOT of athletes of all kinds used and use milk to gain quality lbs of lean body mass or to bulk up.
It's cheap, it has lots of protein in it and lots of vitamins and minerals. Lactose is a sugar indeed but after digestion even the most complex carbs become simple sugars.
I say, if you can digest it and like it, drink it ! The benefits outweigh the disadvantages if you ask me.