A winning record, twice as many TDs to INTs (or near...ex: 18 TDs to 10 Ints is acceptable,,,22 to 12...you get the point), 60% or better Completion rate, movement in/out of the pocket and making plays downfield and NOT running the first chance he gets, Quick reads, Quick release, quick progression thru the reads, you get the adjective I'm using, right?, showing Leadership qualities, shows the ability to make big plays especially when behind in the score and unequivocally in the 4th Quarter. Now, I'm not saying he will do it every time, but to show a propensity to make come from behind plays. And as Post #2 says....show "progress from game to game." And yes...there will be 'stinkers', but hopefully a minimum amount.