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Patrick Semansky/Associated Press

The NFL season hits the first quarter mark after Week 4, and there are already more than a handful of surprises to go along with it.

No one expected the Arizona Cardinals to be undefeated, but here they are at 3-0 with a bye week taking them into the second quarter of the season. The 3-0 Cincinnati Bengals look like they boast the NFL's most explosive offense, and they too enjoyed a bye week to get stars like Vontaze Burfict and Marvin Jones healthy for Week 5.

There are surprises—good and bad—across the league. This week's Power Rankings will take a look at where each team stands with four weeks behind us.