Moretz, winsome and one-note, fights for the human race
One major reason that young-adult fiction is so alluring - when done well - is that it gives youngsters such a fulfilling scenario of independence from those older adults in their lives who always think they're smarter and stronger. That scenario is front and center in "The 5th Wave," where every adult is either evil, inhuman (literally), or nice but helpless. It's truly up to the young - make that the young, buff and good-looking - to save humanity.