Mark has yet to fill out a bio.
Tough to use stats to measure the success of a line. That being said, I can tell you that, according to Pro Football Focus, only five offensive lines surrendered more total pressures in 2012 than the Dallas' did, and only two allowed more hurries. Because the pass-run ratio was imbalanced, those numbers are a little inflated, but even after taking total passing plays into account, PFF concludes that the Cowboys had the 9th-least efficient offensive line in the league in terms of pass blocking.
Thanks, Mark. I've made the argument in so many shapes and forms in different articles over the last few months that I've got nothing new left.
Some recommended reading to help you form your defense:
My analysis of the Nexus: