Oh, no thats true, you have to play with your strength, but also the year the Ravens and also the Buccaneers won the superbowl where sort of "downtimes" for the league. Many of the QBs that are great now were young and just learning the position at the time. During the Ravens run they beat McNair about two years before he became a great QB, Brian Griese who is making a comeback of sorts, but has never been a great QB, Rich Gannon who's servicable and better then average, but most certainly will never be in the Hall of Fame, and Kerry Collins, who was about 3 year out of being a drunk, and is apparently colorblind because he'll throw the ball to anyone.
The year after their superbowl run with the same defense intact they finnaly did play a great QB in Bret Farve and where simply beaten.