Greatest movie ever made based on a cartoon!
Can anyone think of anyone better? Especially for classic sixties cartoons, and especially considering the embarrassing failures of adaptations such as Scooby Doo, Alvin and the Chimpmunks, Smurfs, Yogi Bear, Underdog, ect, this film was just an overall awesome movie experience!
I even looked through this wiki page (link below) listing every movie ever made based on a cartoon and as I read through the list none of them tops this IMO. and I'm not counting the super hero movies (some of which are among my favorites) because they're based on comics which also happened to have cartoon adaptations.
The closest thing I'd think may come to a close (or distant) second is maybe Transformers 1.
http://en.wikipedia.org/wiki/List_of_live-action_films_based_on_cartoons_and_comics