As usual the folks that come in here and pop-off about the defensive line being the begin-all and end-all hand out a few grandiose statements that contain little substance because they never back it up with anything that supports their position.
Here's how you support a position...
First off let's look at the number of pass attempts each defense faced during the 2012 season:
Dallas 511
San Francisco 567
Baltimore 557
The Dallas defense had almost 10% fewer pass attempts made against it than did San Francisco and a little more than 8% fewer pass attempts than the Baltimore defense.
At the same time...
The Cowboys had 34 QB sacks.
The Niners had 38 QB sacks.
The Ravens had 37 QB sacks.
BTW if you think QB sacks win championships, then keep in mind that Baltimore was 15th in the NFL when it came to sacking the QB last season... SF was 11th.
Also considered are QB hits...
The Cowboys had 47.
The Niners had 72.
The Ravens had 37.
What about QB hurries?
The Cowboys had 142.
The Niners had 141.
The Ravens had 151.
Keep in mind the Cowboy defense faced almost 10% fewer pass attempts than the Niner defense.
Now let's take this in another direction...
Let's talk about interceptions, which we already know is an ugly stat for the Cowboys:
Cowboys 7.
SF 14.
Baltimore 13.
However there is one more important stat to consider and that is the number of passes defensed or broken up by each defense:
Cowboys 61.
SF 91.
Baltimore 99.
If you're trying to tell us that the Cowboy pass defense "suffered" due to the poor pass rush... Well you had better bring more than a knife to this gun fight.
I think it's pretty clear the Cowboys pass rush, which not great, isn't the horrible steaming pile that some here try to portray it.
The pass defense on the other hand... Well I hope you brought a plastic bag and pooper scooper.