Garrett adds tremendous value. He's aggressively rebuilt a roster that was badly depleted by 2010, and done it without any stockpiled picks and with very little in the way of salary cap resources to maneuver with. He's assembled a really top-notch coaching staff. If you can't see how the teams will to hang in and compete to win close games has changed the last two years, you're not paying attention.
I can't imagine what the 2011 roster would have done with the injuries, issues and schedule we had with the 2012 season. We've grown leaders in Murray and Dez and Lee and Church (yes, Church) on both sides of the ball. We're playing young players in key positions where we didn't before. We've overhauled our draft process and improved it in the process. We've done this while maintaining a good offensive team--which he's primarily responsible for. We have no dissent in the locker room. He keeps the Dallas Cowboys Traveling Circus nonsense to an absolute minimum (there's only so much that can be done on that front, but he's done it). He handles the press well. He represents the team well. He was masterful in handling the Jerry Brown tragedy last season.
He's got work to do, but he has probably the hardest job in the NFL, and he's been tasked with repairing the wings on the plane in mid-flight. He needs to improve on game day--mostly *not* when it comes to play calling, but definitely when it comes to game management.
All around, I think he's a very good coach. I don't think it's right to overlook the back to back 8-8s as if they were failures. Both of those seasons could easily have been worse. And hockey-sticking things up after Wade let it spiral to 1-7 back in 2010 is something, for whatever reason, he doesn't get much credit for, but it was no mean feat in its own right. That season could easily have been a much bigger disaster (and, please, just this one, no bemoaning the lost of draft position just because we pulled our team out of the tank against long odds).
Honestly, I don't for the life of me understand why it is that some people don't like Jason Garrett. I honestly don't see what they're complaining about. Even when the problem is explained as 'play calling' or whatever, I still don't understand what people are seeing.