For as good as Brady is, I'd still take Elway, Marino and Staubach over him any day and twice on Sunday. Debatable for Aikman, Favre, and Young. Then there's Montana who may be in a category to himself though I rate a few QBs ahead of him but Super Bowl wins sometimes jumps a player over others.
Elway was pretty terrible in some SuperBowls.
http://coldhardfootballfacts.com/Articles/11_693_Super_Bowl_bloodbath:_Brady_demoted!.html