Definitely agree. I only know of one school for sure that uses the "level playing field" approach: U of Washington. (Someone I know got in there and was told this at the interview.) There may be others, but I don't know them by name.
On the other hand, I'd say that the vast majority of schools--especially state schools--are the opposite. The interview is only one component of how you're evaluated by the committee.
A common approach, especially at state schools, is to use point systems where GPA is worth X points, MCAT Y points, and so on. You need a certain minimum score to interview, and your interview performance is also worth a certain maximum number of points. Then all the interviewees are ranked by score, and those with the highest scores get in. The rest are waitlisted, with the score determining your WL rank.
At schools like this, blowing away the interview won't be enough to get you admitted if your stats are well below average compared to other interviewed students.