Clock management is the ultimate in MMQB'ing. You score too early, and people bash you. You cut it too close, and it costs you. Seattle experienced both halves of that misfortune during the Atlanta game, but I thought their clock management was excellent. They led a long drive at the end of the 1st half that would have probably scored had Wilson had the sense to not take a sack (even if he had been penalized for grounding, the 10 second runoff would have still left 6 seconds). And then Seattle took the lead with 31 seconds to go in the second half after using up plenty of clock- that's almost perfect clock management. Unfortunately, it wasn't perfect enough.
If your 2-minute defense is so untrustworthy that you have to score on the game's final play to win a close game, then it's the defense that needs to be investigated, not clock management.