I haven't read it, but my friend has, and said it was awful (as have many other people who actually like decent books).
The books are aimed at insecure 14 year old girls. They're ridiculous (as are the films, in my opinion). The whole ideas in the books are actually stolen from more traditional stories (wuthering heights, pride and prejudice) in which the themes are similar, and it's also stolen from very recent stories - such as the True Blood books (which are good for light reading and if you like fantasy).
In my opinion, don't bother. Read the Southern Vampire Mysteries (based on the True Blood series) by Charlaine Harris if you fancy something to do with vampires/ fantasy.