I just finished three middle grade/YA books. Two I'd highly recommend; one Iw suggest you ignore:
Collins's The Hunger Games is about a futuristic America -- not exactly doomsday, but might as well be. Excellent, clever, creative -- good development of character, excellent sense of setting and intrigue -- each time I thought I knew what would happen next, up to the very end -- well, I didn't.
Brown's Hate List, the story of a school shooting, kept me riveted; I read until my eyes wouldn't focus, but I continued on until I finished the book. Characters very realistic and full of unique voices. I was also impressed that Brown didn't focus on the violence or (any) sex but rather the emotional turmoil and events both before and after the shooting.
Now Grisham's Theodore Boone, Kid Lawyer was a major disappointment. As tightly woven as many of Grisham's novels are, I was unhappy -- and concerned -- about his first venture into kids' books. He apparently underestimates the intellect of young readers; he brought in characters/events/ideas, then dropped them with little or no development. If I could get my money back from Barnes and Noble, I would.