http://admissions.tufts.edu/apply/advice/past-essays/ sample essays from Tufts
GW admissions officers said of essays. A handful made them sit up and want to admit a kid. The vast majority were fine, but really only confirmed the rest of the application. A handful were so awful they put a kid in the immediate reject pile.
One thing regarding essays, is that being a little daring can be a good strategy if you can pull it off. Like calmom’s kid, my son applied to U of Chicago - a few years later - just as it was beginning to shoot up in popularity, but at that time the EA acceptance rate was about 25% and they had not introduced ED. His “Why Chicago Essay” began “When my parents suggested I apply to the University of Chicago I thought they were crazy” and then he listed all the reasons why UC was not a good fit. The second half of the essay was what he found when he dug a little deeper. My favorite was that he wanted a university on one of the coasts and he realized that Lake Michigan was practically a coast. We know it caught their eye because after they accepted him they mentioned it in a holiday card they sent him. Now we know that was part of their recruiting effort, but they had to pick some aspect of his application and that was the one they chose. This was my diamond in the rough kid and he knew he had to take some risks with his essays, because he didn’t have any earthshaking accomplishments to point to and his grades and scores were all over the map. (At least one C+ from freshman year, 100 point spread in SAT scores.)