These lists are always stupid.
There are a handful of exceptional coaches in the league. And then a bunch of guys like Reid and Fisher who aren't exceptional but have won enough to get veteran coach status that's well deserved. Then there's everybody else with a few coaches (Tomsula) who just simply make you scratch your head. Garrett belongs in the 'everybody else' category for the time being, but I suspect he ends up in one of the top groups before it's all said and done.
And, like it *always* happens in these coach threads, it bears repeating that the team's won/loss record for a given year is not an accurate measure of the direction of the franchise or the ability of the head coach. It simply takes longer than a season or two to establish a program, and there are simply too many factors that are involved in assembling a staff and a roster to be lazy about evaluating the HC.
I've said it since Jason took over in Dallas, but the change in leadership and direction and in the quality of the player development, roster decision making, and the drafting since he's gotten here as been obvious. Now, we're seeing threads where even the loudest malcontents are gradually conceding that the draft and the direction is improving. That's isn't happening just by accident. At one point in one of these Garrett threads--back when just about everybody and his brother wanted to ride the guy out of town on a rail, I quoted a paragraph from John Wooden's biography that he considered his best job coaching ever to have been on a team that finished below .500. That sticks in my mind when the topic of coaching comes up because I think it's a fairly compelling argument for looking underneath the hood of any given coaching job if I've ever heard one. There are going to be ups and downs and fluctuations in the roster. A good coach is a guy who can keep the team trending up over a time. A great one gets them trending to the top a few times while he's lucky enough to be in the job. And fans are going to complain along the way, no matter what.