My problem with pre-season polls is this: While they are "educated" guesses, based on a programs success the previous year, then taking into consideration who was lost, who returns, etc.......its still just that, a GUESS.
The problem now is teams who are given the benefit of the doubt and ranked in the top 5, top 10, etc, have more of a fall back cushion if they lose a game or even two. If USC starts out at 6-0, then loses a game, they fall to 4th or 5th in a worse case scenario. Now, take a team from outside the top 25 starts out at 6-0, makes their way to the top 20, then they lose a game, they're probably dropping down to 25 if not out of the polls. You've got two 6-1 teams, one is very much in the hunt for a National Title and the other is hoping to run the table and maybe get an at-large BCS bid, but will probably settle for the Gator or Chick-fil-a Bowl.
All this because the teams success/failure the previous year.
There shouldnt be ANY polls that have an impact on the BCS standings until week 5 or 6. And honestly, as much money thats is made off these big time bowl games, I dont see a playoff system anytime soon. If the Rose, Fiesta, Orange, and Sugar bowls are integrated into a playoff system, that takes a lot of the lustre away from those games because they become a stepping stone instead of having the limelight all to themselves.