Part of the reason why the defense sucks is because the offense (notice I said offense, not Dak) is having a big problem with time of possession. The defense can't be on the field 45 minutes a game, the offense has to do their part and they are not doing their job.
I think a bit of exageration and assumption/perception on your part.
dallas avg. TOP this season is 27.5 minutes..... its not good. I rather have more, but when you can't run, then you tend to stop the clock more often.
and what's the excuse for first half lack of performance? even on first drives. at home, in the past 4 games we have not stopped the opponent on first drive at all. same with second drives and third drives.
the defenses job is to get off the field....and they can't. because they can't stop the run. ....ravens rushed for 274 yards....that will tend to get the clock in your favor.
NO scored on their first 6 possessions. including all the drives in the first half.
detroit scored on 9 of 10 possessions. the giants didn't have to punt until end of 3rd quarter.... the freaking GIANTS!!!!!
so to say the defense is bad, because offense is not controlling the clock doesn't totally make sense. you can't put the blame on offense only.
Browns TOP : 29 vs. 31
Saints TOP : 29.5 vs. 30.5
Ravens: 25 vs. 35 ---- Ravens rushed for 275 yards
Giants: 24 vs. 35
Steelers : 32 vs. 27.5
Detroit: 25- 35
so 45 minutes a bit of exageration. but also the defense is responsible to get off the field. you can't even say they are tired, because stats in first half are closer than final results above, since in the blowouts, the opponent just runs out the clock in the 4th and the TOP is mostly in their favor in the 4th.