It's hard to make too many generalizations about the old debate of whether the GPA or MCAT is more important. Truth is, they're both important. Don't let yourself get tricked into believing that it's okay to slide on one part of your app, because that would likely come back to haunt you later. You will see some accepted students with high GPA/low MCAT, or vice-versa, but in reality, it's much more common to see high GPA/high MCAT.
For every person who gets rejected with a low GPA/high MCAT, another person will have multiple acceptances. For every high GPA/low MCAT who gets accepted, another will be struggling to get interviews. Don't let SDN or MDapps skew your perspective. Both elements of the application are important, and the people who get in with uneven GPA/MCAT ratios tend to be those who are outstanding in other regards. Besides, when you're talking about these kinds of people, you're talking about probably less than 5% of the accepted pool, so making generalizations about this demographic has little utility, IMO.
But, for what it's worth, I still believe that a high MCAT can overcome a less than perfect GPA (but definitely not under 3.0) more easily than a high GPA can cover for lackluster performance on the MCAT. Just my $0.02.