I think if you can get your GPA up into the 3.2+ range, your field clinical experiences will be quite helpful, but frankly, they can't really overcome a poor GPA or poor MCAT. Remember that they are essentially evaluating you on a few criteria that GPA, MCAT, clinical experience, research experience, etc. all represent. What adcoms basically want to see is that you are strong enough in all of them to succeed and 1 or more of them to be outstanding. You've got the latter part (i.e., excellent clinical experience showing a potentially very strong desire to be a physician); however, in addition to a focused desire to practice medicine, they need to see that you will be successful in all areas and a VERY major area in medical SCHOOL is the academic part. A sub-3.0 simply doesn't promise much in terms of success in your studies and they're not going to want to risk a spot on you if you have a 40-50% chance of failing out based on their calculations.