I've learned a lot about language from reading slush. You can immediately tell if a writer is in control of the narrative. This writer will avoid using too many words like "possibly," "probably," "maybe," "perhaps," etc. He/she will avoid using clichés, as well as a lot of metaphors, and won't take four sentences to say what they could in one (or write a great sentence and follow it up with a bunch of stuff that just weakens it).