Quinn played really well against Bama last season. And he also played really well against OU last season, but only after an abysmal start. He started out dazed and confused just like this season against OU, but he regained his composure and finished strong. It wasn't enough to overcome the bad start though. We had no business losing that game.
I totally get why Sark prefers to let him play through it, because when he finally gets it together, he's damn good and you don't want to further undermine his confidence. Likewise, it sends the message to QB recruits that they will be given every chance to develop themselves when playing through adversity. It's difficult to predict exactly when, or whether, Quinn will right his ship in a game, or going forward. And, of course, you have no guarantee the backup will fare better. So I don't have a problem whatsoever with Sark showing patience with it. It's a matter of when do you make the call to bring in the backup QB. That is subjective but to me it's when do you think another opposing score is too deep of a hole to get out of with no indication of improvement. It's also not uncommon or wrong, to put a backup QB into a game just to see if it will give a spark to the offense and/or figuratively splash some cold water in the starter's face.
The coach has to be able to manage that situation and have the backbone to make the call regardless of how the media spins it or perceived reactions. It's his team and locker-room.