I don't often read young adult novels; too many of the teen characters leave me feeling like I wasn't like them even when I was fifteen, and I just can't identify. I do have two series to recommend that work well even for a more jaded adult reader of science fiction and fantasy such as myself.
First is Cinder by Melissa Meyer. This Cinderella retelling is set in a far distant, post-World War IV world, and our heroine is a clever young mechanic who has a cyborg arm and foot. This marks her as semi-human and of the very lowest social standing. Her doting adoptive father is gone, leaving her owned by her sadistically cruel stepmother. One of her step sisters is somewhat kind to her, but is little more than a child herself and can't help her. There's a handsome prince, a dreadful, contagious and incurable disease sweeping the earth and an ~evil~ queen from Luna. While some elements of the story will seem old hat to the more cynical, I thought it had enough charm and verve to carry off a story we've all heard before and make it fresh again. I like the series so well I've already got a hold on Winter (book #5 in the Lunar Chronicles) even though I'll be using up one of my holds for nine months just to read it as soon as I can.
Ari Marmell has written several adult fantasy novels, none of them particularly well known or best sellers. I did like Hot Lead, Cold Iron and The Conqueror's Shadow. He also just published the final novel in a young adult series that begins with Thief's Covenant about a girl named Widdershins. In this world, gods have powers based on the number of worshippers they have. Olgun's congregation is slaughtered except for one young girl hidden in the shadows. She flees to the streets and takes the name Widdershins. Olgun can't perform miracles for his last worshipper, but he can push the edges a bit. He can make a flintlock misfire. He can make her run faster, jump higher, and walk quieter than an ordinary human and with his help, Widdershins survives as a thief. While Olgun's help make her mildly superpowered, she still feels real and, like any teen, she has moments of foolishness and moments of maturity. If you like fantasy and wouldn't mind a younger protagonist, this series has been a very enjoyable light read. I'm sorry to be done with it and I'll give the next book by this author a chance because of it.