I took my dad to go see it since he was a fan of the series when he was young. He enjoyed it, which was good enough for me.
The only thing I didn't like was the cursing. It seemed very out of place in what was supposed to be a family film. There was HUGE group of kids when I went to see it (someone's birthday party I think) and I heard some parent's whispering to each other asking if it was really a PG movie.
Other than that, the visuals were pretty nice, and the movie itself wasn't bad. From not having seen any of the actual show, it was a decent film.