I'm not sure how you think the Cowboys had such a good team?
Who did they beat this season?
Half of their wins came within the NFC East, the worst Divison in the NFL.
Now let's go over their other 6 wins, Chargers ( 9-8 ) Panthers ( 5-12 )Pats ( 10-7 )
Vikings ( 8-9 ) Falcons ( 7-10 ) and Saints ( 9-8 )
The truth is that the Cowboys are good enough to beat up on a weak NFC East, and win a few against average or just above average teams.
and Yes, it doesn't help that Mike McCarthy is the head coach