The Arizona Cardinals have fallen out of the top 10 in all major NFL power rankings after suffering a surprising loss at home to the Buffalo Bills on Sunday. The loss was the second in a row for the Cardinals, who fell at St. Louis in Week 5.

SB Nation's NFL guru, Joel Thorman, put the Cardinals at No. 15 in his power rankings, six spots down from last week. Thorman wonders if the Cards are as good as their 4-0 start:

So, the Cards aren't for real? That's two losses in a row after the 4-0 start. The NFC West is suddenly super competitive.

Brian Billick of Fox Sports dropped Arizona even lower, putting them at No. 16 after having the Cards at No. 8 last week. Billick thinks the big guys up front are holding the team back:

This is easily the worst offensive line in all of the NFL. Easily. It's not even close.

CBS and Yahoo both put the Cardinals at No. 12, while ESPN gave Arizona the most love with a No. 11 ranking. The Cardinals will look to get back on track when they face the Vikings in Minnesota on Sunday.