By Jordan Raanan, Xfinity Sports
There are five undefeated teams through four weeks and it's a pretty steep drop-off from there. Here are this week's NFL power rankings: Jordan Raanan has covered the NFL since 2005. Follow him on Twitter @JordanRaanan, on Facebook or email him at email@example.com. The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.