It is really hard to judge the defenses performance. True they held the Cowboys to 3 points in the first half and true they lost 4 starters for either the game or for series on the other hand they were missing tackles all over the place and they were a split second late in getting to Romo all night.
I will say overall I am happy with the scheme the Bears are using. I like seeing them getting after the QB. Seeing Urlacher with 3 sacks already this season is good. Of course, they don't seem to be doing much to disguise the blitz. At least they are being aggressive in getting after the QB.
They do need to address the middle of the field. They are getting gashed there. Gates, TO and I dare say Gonzo could have done more with a better QB. We have to find away to control the middle of the field.