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Jeff Chiu/Associated Press

The preseason is over, and now the games matter. Which teams look ready to take on the rest of the league and challenge for a shot at the Super Bowl, and which clubs should spend as much time as possible scouting for the upcoming NFL draft?

Power rankings are a weekly check on the pulse of each team. They are reactionary, entertaining and yet predictive of which roster looks the best on a weekly basis.

Coming off the preseason, the initial rankings are based on expectations for each team and then adjusted for injuries, suspensions, poor play and surprising developments. A shocking preseason loss means very little to these initial rankings, but from here on out, every game matters.