I have two different experiences on this. I interviewed at UofTexas and at LECOM. At Texas, I feel I did well on the interview, nailed all questions, even brought up some of their current research projects that I was interested in. However, I was not accepted because my GPA was too low, so basically there was never a point to the interview in the first place (they had already decided before I went).
At LECOM, they had all my information to begin with and a majority of the interview focused on my GPA. I feel I excelled in that interview as well, and I was accepted.
Basically, it depends on the school, some will only call you in if your stats meet their standards, some will call you in regardless and there's nothing you can do. So... good luck!
As a caveat to this, the UT interview was not a complete waste. I learned much about the interview process, and got a dry run at the experience which helped with the confidence levels.