I pretty sure all schools and admissions/administration people say if you received an interview invite that your stats are fine. However, because your entire file gets re-reviewed before the final decision, I'd imagine that your numbers matter somewhat. But in general, I wouldn't worry about your numbers too much... To get an interview, they were really interested in your application as a whole.
This is what I've imagined what happened to me. I have great extracurriculars. Prior to returning to school I had started and ran a successful business, I am also a published author (short stories in magazines and collections) and had been working, at the time of the interview, in an E.D. for nearly 2 years. However, my MCAT was an unbalanced 24 (with a 6 in P.S. and an 11 in V.R.) and my GPA wasn't so hot (Cumulative = 3.65 but my Science = 3.05). And for better or worse, I had yet to graduate, which I did this past spring. I think the committee review after the interview saw my numbers and decided to waitlist me.
Seeing as how I was placed on several other waitlists last year and that I was able to communicate with them as to why I wasn't outright accepted, I found that, not surprisingly, my low numbers were holding me back.
After graduating and retaking the MCAT this past spring I was able to improve in both areas. I earned a balanced 31 (10,10,11) on the MCAT and brought my Sci-GPA to nearly a 3.20 accompanied by a higher cumulative.
And, as some of you may know, I was offered an early acceptance off the waitlist at TU-COM CA which means that I had to get all my applications together way before I was offered the seat. Since then I've continued to be offered interviews (D.O. & M.D.) that I turn down, all though its a bittersweet experience to turn down interviews after working so hard all these years.
While it is true that I may have interpreted my performance in the interview incorrectly, after sitting for many more interviews since that one I really think I did do well. Especially compared to my interview last year at PNWU which I think I blew -- and, wouldn't you know it, that was the one school which did not even consider me after the interview!
Good luck everyone.