Namath is the worst QB in this list. By far.
I can't say this isn't true because I don't know much about the old school QBs.
I can say Brady at least has a solid shot at worst QB on the list from the more recent eras.
It seems people consider "winning Super Bowls" to be the most important attribute. Which is fine, but I'd be curious to see what would have happened if Montana was a Falcon and Bradshaw was a Brown. Are they suddenly significantly worse QBs if they can't win Super Bowls?
Super Bowl wins are the single biggest reason QBs get over rated. A QB should be evaluated based upon his skills and abilities. Winning matters too, but a QB doesn't do it all himself, so someone who wins multiple Super Bowls may not be nearly the QB someone who never even plays in one might be.
In the regular season, I'd take Marino all day long. In the playoffs, I'd take Bradshaw.
I'd take Marino over Bradshaw in any game at any time. Marino was more skilled and just played better. Bradshaw is over rated enough that the only player I know who is certainly more over rated than Bradshaw is Brady.
A lot of you guys put Steve Young and Peyton Manning up near the top. Those guys LOST way more championship games than they won. Manning to Brady, Young to Favre and Aikman.
I would take Steve Young over Favre or Aikman (though not by much), and I would take Peyton Manning over Brady every day all day long.