What is the difference between modern movies and old movies?

Now the conditions with good ah, a lot of previous can not do, now can do, especially science fiction and magic this piece, is more than before can not compare. Like "Transformers" series, before only out of the animated movie, but now can make those childhood memories of robots alive in the big screen. In addition to the technical level, there are traces of the times, take our country's old movies, before the limitations of the times, a lot of programmed, such as good people and bad people rely on looks, the audience can see at a glance. Now it is much better, more focused on the film itself.