The bottom line is that when something works, fans are happy and coaches are praised. When something doesn't work, fans are unhappy and coaches are criticized.
The truth is that it's mostly on the players. If they execute, the play-call works, and the coaches look like geniuses. If Romo hits Miles with an accurate pass and we move the chains, we win and the fans are happy. The overall run/pass ratio may still have been questioned, but nobody would be complaining about the pass that iced the game.
When we played at the Giants this year, we passed on 3rd down to move the chains when we were already in FG range. The result? Romo hits Beasley for the 1st down which allowed us to run the clock down and end the game on Bailey's field goal. Did anyone complain about the pass call there? Didn't think so. Oh, but if Romo's pass to Bailey was picked off and returned for a TD? Then Garrett/Callahan are idiots who need to be fired immediately.
Opening day 2007, Cowboys host the Giants. Cowboys up 38-35 with the ball and 3 minutes left... Giants are selling out to stop the run. There are 1-on-1's outside with no safety help. Romo hits Sam Hurd on a slant and Hurd breaks free for a long, game-clinching touchdown. Cowboys win 45-35. Never heard a single complaint about that play-call.