One of my favorite genres of books is Young Adult. Nothing with Vampires or love triangels, but books like From the Mixed Up Files of Mrs. Basil E. Frankweiler, A Wrinkle in Time, Matilda, The Chronicles of Narnia, When You Reach Me etc.
I love this genre probably for the same reasons I love any movie that was made in the 90s and is rated PG. I enjoy: optimism, knowing things will be sorted out by the end, unambiguous morals, larger than life characters, and so on and so forth.
I've read (and enjoyed) War and Peace but I'd rather read Harry Potter. And sure, I love Fight Club, but if the choice is that or The Mighty Ducks then "Quack. Quack. Quack. Quack..."
Dash and Lilly's Book of Dares by Rachel Cohn and David Levithan (who also wrote Nick and Norah's Infinite Playlist) is one of my favorite YA novels and one I always recommend to people. Especially if you are a fan of John Green. Any author that does not "write down" to their young audience (meaning the dialogue isn't asinine and the pop culture references may have to be Googled) has my respect. I tend to enjoy Cohn and Levithan books more than John Green's because they are typically much lighter in subject matter and pack much more quip style wise.