Pre-season polls don't mean anything. Look at any Sports Illustrated pre-playoffs issue and you'll see why: They are always 50% wrong. The regular season tilt between USC-Ohio State will be interesting though, wiping one out of the National Title race early.
And there are always one or more teams that over achieve and mess up everyones polls. Missouri, Rutgers and Boise State stand out as examples.
Just like the baseball season, you have to wait for the All Star break to see who the
real contenders are.
Give it time.