I read the book in high school and read the entire LOTR trilogy during Christmas break while in grad school.
I liked the movie but was surprised at the level of violence since the Hobbit was a kid's book. I thought a PG movie would have been more appropriate to the book than a PG-13 movie.
I have no problem with the movie bringing in material from other Tolkien sources. The movie does vary in some details from the book but I think less so than many other adaptations by Hollywood.
My two sons (ages 11 & 13) both liked it although not as much as the Avengers.
