Oh come on the movie wasn't that bad. I confess that the singing dolphins at the beginning scared the heck out of me!
Consider that the books were written after that the BBC radio play had had a tremendous success. So the story wasn't really concieved as a novel but as a play.
It is some time that I've seen the show so I might be wrong on the following statements.
The TV shows cover only the first two books while the movie is based mainly on the first book so to me it covers the story better than the TV show.
I must admit that it really is fast paced but on the other hand it introduces characters (like Humma Kavula) that were left out in the shows.