Dallas did look impressive on D in the first half. BB admitted they showed some looks that they haven't shown all year and it took some time for the Patriots to adjust. Dallas' problems were 2 fold - 1) they don't let Weeden do anything (or maybe he's not capable of doing anything else) except a very plodding, short-gain offense and they couldn't take any advantage when they had the Pats flummoxed; and 2) once the Pats adjusted (as Dallas should have anticipated), they had nothing else to throw at the Pats, so the Pats went into their usual high octane O and left Dallas in the dust.
Dallas stopped the Pats on 4th and 1 with something like 9:45 left in the game. They needed 3 scores, so they had to go into a 2 minute offense to have a chance (figuring you have to stop the Pats with 3 & out the 2 times they get the ball). Instead it was the same p-l-o-d-d-i-n-g offense, with no sense of urgency. Dallas had better hope Matt Cassell gets the start after the bye or they can kiss their season goodbye.