I can't believe anyone's mentioning Twilight in any form of comparison with this, because the only thing they have in common is it deals with vampires...

While I felt the story itself was kind of basic (what is original anymore?), I did like the characters, and Eli's character I found particularly interesting (I would have enjoyed more details about his background), as well as the way vampires were portrayed. Oskar was a bit of a wimp, but alright nevertheless.
Overall I found it a very interesting read- and as I've also watched the movie, I would've wished to see in it a bit more of the book. I still think the adaptation was great too, and both are worth it.