Yeah, you're probably right. Which is why it just all comes down to player evaluation. If a GM knows how to scout a QB, he'll be able to avoid the bad ones and pounce on the good ones. But it's a minefield; a GM has to avoid the Josh Freemans, Blain Gabberts, Jake Lockers and Christian Ponders and get lucky that Rodgers or Flacco falls, or that Brees/Manning become free agents (and injuries aren't an issue), or that you hit on a late draft pick (Brady, Wilson, Prescott), or you get a top 10 pick in a QB heavy draft (Eli, Rivers, Roethlisberger, Ryan, Luck). Sucks but step 1 is avoiding the crappy QBs so you can get lucky to grab a good one if he's available.