Arizona's defense ranks 24th and just gave up the most yards they've given up since they were the Chicago Cardinals. That includes some pretty bad teams over the years with some pretty awful quarterbacks. Their defense was just plain bad yesterday and has been mediocre all season.
When you look at the Cardinals overall, they seem to be a team that has been winning in spite of themselves. With the #24 defense and #28 offense, the fact that they've won 11 games is a bit of a puzzler. They average 3.3 yards per rush. They complete 56.6% of their passes (62.9% with Palmer). They're 24th in scoring. Yet somehow they are 4th in points allowed. They've survived on a +0.9 point scoring differential. What does all this point to? I'm not entirely sure but it looks like a team that has been very lucky, especially on defense. Maybe they're a team that is lazy until **** gets real in the 4th quarter. Either way, they are overachieving.
So am I afraid of this team? Not particularly. Rodgers should be able to light them up all day. Here's an interesting article on them:
http://fivethirtyeight.com/datalab/the-arizona-cardinals-have-been-the-luckiest-team-in-the-nfl/