I have read all of her book and I like them very much, they are all about girls working through different problems so if you don't like that stuff I wouldn't recommend it. My favorite is Just Listen but her best it probably Along for the Ride. Some of them are aggravating because the character is not doing something that she should be doing and its aggravating but also good.
If you want to look at what her books are about here's her website www.sarahdessen.com and it gives a short summary of all her books.