I scored terribly in the quant section (67%tile) (and that was the higher of my two scores!) and still got a 710 due to a 46 (99%tile) on Verbal. Odd thing for me is that I am a financial professional, (series 7, banking training program and corporate finance background).
It annoys the hell out of me that I did that poorly, but I didn't talk about it in my optional section at Kellogg, mainly because I think anyone looking at my application will be able to determine that I have strong quant and math skills from college finance and calculus classes, and relevant work experience. I don't know why the hell I did so badly in those tests, as I didn't do that badly in the practice tests.
I hope the test doesn't end up being a critical flaw in my application, but if schools like Kellogg and Chicago really mean what they say about looking at the "whole" you, I can't I am hopeful that the rest of application compensates.
Granted, if I get dinged from Kellogg in R1, I will retake the test again in time for Chicago R2.