What was your essay question? lol
Mine was "what would you do if you win lottery." I said I was going to help my best friend who is suffering from financial problem due to his father's heart disease. Then I said I would buy and open "Jack In The Box" in east coast. (we don't have Jack In The Box in east coast lol)
Bottom line is... They def. want to know whether you can write and prove your points. It's more like they would like to see you communicate without problems. (It's because they don't want to have people who can barely speak in English, especially when they have PBL aka group working)
You should be fine as long as you didn't try to write something stupid.
Good Luck! We could be classmates. STILL DECIDING BETWEEN Tufts and USC. !