They're not really that good of a ship, considering they combine both of the bad parts of Battleship/Cruiser classes. They dont really have a specialization either, but considering that, neither do battleships. Battlecruisers were designed to be seen by newbies when they get 400m + to stop them from getting a battleship. Battleships are the ship class it takes the most people to kill. Hence, Battlecruisers.