If you look at my concerns and highlights, you'll find I both marked positive and negative role models. Why? Simply because there are some bad role models and some good ones too.
The Cullen Coven, definately Edward, are the positive role models showing love and care for the [helpless] 17 year-old Bella. Yet, the other vampire gangs, including the hunter, are evil and set to break the two up with the death of either partner.
I believe that teenagers who read and understand the book should like the movie based on it's representation of the book. The saga is hard to follow because of the many aspects and characters.
Therefore, only teenagers and young adults will find the Twilight Saga more interesting. Younger kids will be scared.