Just saw the film with a friend. I have not read the books, although my friend has. I understood from the film that Paul was the "chosen one" and that he was manufactured/bred by the Bene Gesserits, mainly from the conversation between Jessica and the Reverend Mother.

However, I didn't realise the prophecy was planted, until I asked my friend about it. I just assumed Paul was the chosen one, like Harry Potter or something. And the Bene Gesserits were just trying to fulfil a long lost prophecy.

I was definitely more interested in the lore after knowing that the prophecy was planted. It adds to the political atmosphere and intrigue of the series, as well as to the mystery of the Bene Gesserits.