Say what you will about Jurassic Park's often questionable plot, but the movie still manages to be about "something" - that is, the movie works as a deft criticism of the ever-expanding nature of Hollywood blockbusters, and as a brilliant allegory of the pitfalls of capitalism (with a little bit of "you can't fight instinct/change nature!" thrown in for good measure). When you sit down to write your own script, it's important that - aside from what's actually happening page by page - it has something to say about human beings and the state of the world. It doesn't have to preach or attempt to sway opinion, but it should make a convincing case for something - politically, creatively, morally... give it a good reason to exist. Because a film with something to say is more likely to capture somebody's imagination; a spec script reader is fifty times more likely to recommend a screenplay that taps into something about today's world - something entertaining that also has a point of view.