If you are applying to a top MBA program that is ranked high, you will need a high score just to qualify for an admission. The average GMAT scores are upwards of 680 in most of the top MBA programs in the US. This figure can be as high as 720 for students from Asian countries who normally score higher. So, if you are applying to a top MBA program, you will need a high GMAT score just to stay in contention. You will first need to get a good score, and then work to get the other application issues right. Your past academic, professional and personal background that you project through information you fill in your application form, and the quality of your application essays finally get you an admission. Since admissions are very competitive, it’s the quality of your background that gets you an admission.
Things could be different if you are not so particular about applying to the ranked MBA programs. The GMAT could be one of the most important factors for admission. If you have a score that is much higher than the average GMAT score indicated by the university, your chances of admission are really good as long as you fulfill the basic requirements. You must have the specified number of years of work experience, the required undergraduate academic performance, and fulfill the application requirements required by the university and you will be on your way. It’s the numbers you have to get right here - fulfill all application requirements, have the required number of years of work experience and an average academic background.
To sum it up, your GMAT score can just qualify you for admission if you are applying to a top program, whereas it can get you an admission if you are not applying to the ranked programs. In either case, a high score can work to your advantage.