my two cents,
i would first evaulate whether your are a competitive student in terms of gpa and mcat scores. if you're not even near the averages for last year, i think it wouldn't be too wise.
the admissins committee often reviews applicants and priotizes those applicants whom they feel are the strongest candidates in terms of grades and test scores. yes, people will say that other factors are important. however, you need to be realize that everyone else has the a tremdous amount of experience such as volunteer, research, and recommendations. if you're scores and gpa are above the averages from last year, i would consider the option.