It has a great plot, characters, and effects. I've watched most (but not all) of it, and it's one of my favorite shows at the moment. I highly recommend it for fans of supernatural and mystery shows.
There is violence like stabbing, shooting, suffocating, and fistfights; but nothing too graphic is shown. There are some intense make-out scenes, but those also aren't extremely graphic and have never lasted longer than 20 seconds. A mature 11-year-old could probably watch this.
This title contains:
Positive role models
Violence & scariness