A flat main character whose story really should have been from first person POV, since everyone else just tells him exactly what they are thinking/feeling anyway and it never shows anything happening outside of his field of vision. This series had an interesting premise--a world scorched by sun flares, people struggling to survive the aftermath, a virus that drives the survivors mad--and then it just loses it by forcing the traditional teenagers vs the evil government cliche. It seemed as though the author was just killing people off to give the readers a sense of the danger/bloodlust. Maybe I've seen too many zombie movies, but after fight #599 I was just flipping through the punches and kicks. 
 Too many unanswered questions don't make the reader curious--it makes the reader frustrated and seems like a cop-out. The biggest one of all: why would anyone with a lick of sense, unless they were already infected, release a virus when they haven't manufactured a vaccine?