Auburn should be happy. They're a good team, and deserving of a national championship opportunity. That being said, I think Oklahoma is a better team. Then again, I also think both OU and Auburn could argue they're better than USC who struggled several times against weak times and played a rather weak schedule.
But Auburn has the BEST shot at a national title right now. OU and USC face each other, and one of them is going down. Auburn is playing a much weaker team likely for a split national title.