As promised here is how Quarterbacks should be judged:
First and foremost take the following factors from your leagues scoring system into account:
Are passing touchdowns worth 4 or 6 points. If they are worth 6 points having a top five quarterback is of the utmost importance.
If they are worth 4 points then running quarterbacks take precedence in your rankings
If the qb is hit with negative points for interceptions you have to downgrade the so called gunslingers.
If the qb plays behind a weak O-line he may not succeed no matter what his track record has been
Is the head coach stable and established? If so you can generally count on the qb to be secure as well
Is the team run or pass first? Does the HC like to score or is he content to grind the clock once he gets a lead. The qb on a grinding team does no favors to his fantasy owner.