As a game, yes, it was absolutely horrendous in many respects, and they deserved to lose 110%.
As to why they lost, it's a combination of effort (WAS came to play the game of their season at full bore, Dallas came out off balance and sluggish), and horrendous coaching.
You can't tell me with a ~7 yard average rush, that you pass it three times on short yardage, or that you also abandon the run constantly through short-yard downs.
It can be positive if they figure out the obvious mistakes, or negative if they don't. I can't imagine anyone not seeing it though, the entire sports press is already ripping them a third asshole for the worst coaching job of the year by a landslide.