I don't think that he/she was wrong in what they said. It's inferable from the available data on the AAMC website. On the average, retakers do not improve their MCAT score, and the average of retakers is considerably lower than the average for the MCAT. The median of MCAT scores at the "top tier" universities is considerably higher than the average for retakers, as well as the national average for matriculants in any given testing year. It's inferable that, on avearge, matriculants to "top tier" schools are more often first time test takers than retakers.
Of cousre there'll be issues with variability at the high and low end, the uncommon story of a person retaking and doing more than 2-3 pts better, etc.
And as others have said, it does depend on what your dream school is. If your dream school is in the top ten, then if you interviewed the first year, did not interview this year, then you should be realistic about your chances next year. If you do retake the MCAT, you have to be absolutely, 100% sure that your score will go up considerably. Not just one or two points (Depending on how low your VR was). Without specific information on your application, it's extremely hard for any of us to say.
All we can tell you is:
1) Taking the MCAT more than once or twice is usually a negative.
2) Retakers often do not do much better, but it is definitely possible to improve.
3) If you didn't get an interview there this year, but did last year, what changed?
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