The most of us like cinema but we don't know how it's made.
The first, the future succes of the film depends on the right choice of scenario, a good director and of corse of  a brilliant game of actors. But I don't agree that actor should be famous because it's more interesting and better for this film to find a new face. So there are many talented guys who can reincarnatein a role. They usually became very famous after that.