I am not a fan of the cartoon (I am not a fan of them), but I went with a friend to this movie and it was incredible. There wasn't too much of a need to explain anything details to me, which is good for someone who hasn't seen the show. They left it open for more movies, and I will definitely be going to see them.
It probably didn't help that I actually read this book prior to seeing the movie because it ruined all the surprises for me. For the first two movies, I didn't read the books and was surprised when I saw them in the theater. Not saying it was a bad movie, even though I already knew what was going to happen I still loved it.