How you gonna tell somebody about you in writing? Essays.
I think its the total package but probably the essays are the most important. I know people admitted to top b-schools with 650 score and strong essays and I also know people rejected with 770 score and weak essays. I don't want to discourage you but assays can be improved. You are the best person to write strong essays and could also take help from Consultants. Many times, incidence that we think are small are actually really important and we generally don't mention those in our essays. So think retrospectively and note down the points whenever they come to your mind. Then put the points noted into words and you should be fine.
SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008