When it comes to power rankings, the whole idea of their value flows from the fact that they're somewhat of a living document. They shift with the ebbs and flows of a season, with each performance typically reflecting a jump or a tumble, often at a knee-jerk pace. The challenge becomes weighing out the significance of a team's performance, while also taking into account the strength or weakness of their opponent.
The fine folks at NFL Spin Zone have been posting their weekly power rankings of the entire league each week. In the ramp-up to week one, the Cleveland Browns were ranked #30.