Richt won 10 games with Rosier at QB. We still sucked. Winning 10 games is not some gauge for long term success. Long term success means finding a quarterback much better than the guys we have that aren't good to begin with.
HE did not beat Clemson, nor did HE almost beat FSU. Trent Dilfer did not win the super bowl. If you are saying he played his position well, I would say even that is up for debate.