This sort of thing actually gets me riled up. I KNOW Brady Quinn. We're not best buds, but he lived down the hall from me, went to a Christian club on campus several times where I led music, and still says hello to me by name when we pass on campus. A dick? No way. Not ever. That's just wrong. People sometimes place things like that on other people because they EXPECT him to be that way, but that's not Brady.
Case in point, I worked with Young Life as an undergraduate for four years. YL is a outreach program that caters to local high schools. We decided one time to try to have a ND football themed club. We got Josh Schmidt (walk-on FB, a very good friend of mine), Derek Curry and Brady to all come to our club. And not just for community service (see, tOSU, Miami), they came free of obligation, just as a favor to me and a help to these kids, and played the games, even pulling of a hilarious improv comedy sketch with us. Then each spoke at the end, sharing with these HS kids they had just met that night.
Brady is a warm, centered, and down-to-earth person. Anyone who says otherwise simply has not actually MET him, talked with him, or spent any amount of time with him.