Formulaic. Simplistic world building. Skimmed the second half of the book (not something I often do). Felt younger than a lot of the YA dystopians. Just not for me... 
 I'd rank Legend below XVI, Divergent and Delirium and above Wither in the recent YA dystopian craze. I will say that the movie adaptation could be good, because it's very visual and action-y. So, I may revisit this one if it does become a film (I know the rights have been acquired by a major studio).