Mankind as ruler of the galaxy? Not so fast there, buddy boy. Armed alien arachnids are colonizing and annihilating the galaxy. “Starship Troopers” is like “Aliens”-meets-“Full Metal Jacket” meets-“Beverly Hills 90210.” Galactic grads assault an unrelenting onslaught of spider-like assassins. Dutch director Paul Verhoeven doesn’t skimp with some 550 digital mind-blowing (literally) special effects.