Anyone ever think the SEC had five of the top ten defenses because the SEC sucks at offense? Any team that fails to move the sticks - and the SEC has plenty of teams like that - is going to make the other team look like a great defense. Hell, four of the top five are from the SEC. The list of the top 30 defenses in the country is littered with such powerhouses like Arkansas State, Kent State, Florida International, Louisiana Monroe, and Temple. They look really good overall because their conferences aren't really focused on scoring offensive touchdowns. Sadly, they aren't even focused on moving the sticks.
More balanced teams don't have such stellar statistics but they find the way to win. Both Stanford and Oklahoma State would have demolished LSU the way they played against Alabama. Stanford's offensive line can move any defensive line in the country. And Justin Blackmon is simply superman out there against every defense big and small alike. People knock Oklahoma State's defense, but it has came through repeatedly when it counted. And nobody forces turnovers like that defense.
In case you missed that game where LSU beat West Virginia, the latter team destroyed their defense. West Virginia shoved the ball down their throats on the goal line, just as Stanford would have done. The difference was four WVU turnovers. If they had found a way to hold on to the ball and get decent field position it could have easily been a blow out the opposite way.
Oklahoma State's loss came right after a tragedy that caused a major distraction not only to the football team but to the whole country. Its understandable why they got upset.