Andy Dalton is PFF’s 2nd highest graded passer this season

Is he playing bad or horrible. I don't think so. And he isn't the reason why we win or lose either. But that's just my opinion.
Again, the disagreement is whether Dalton should take a seat for the starter. The fact that “he isn’t playing bad or horrible” is not a good criteria to keep the backup on the field. Backups play while starters are out, then take a seat when they can play.