Sure Cassell won 11 games.... but Brady won 16 with WRs who were BRAND NEW to the system... He also sat out 90% of the 3rd and 4th quarters of his 50 TD season.
Manning is the ultimate choke artist, and benefitted from a subpar division to rack up his stats, even Jim Sorgi has a 100 qb rating running that offense.
Philip Rivers is a great leader and helps his team win, but plays in one of the weakest divisions in football.
McNabb has done the most with the least throughout his career... but he is not the best right now.
Roethlisberger is tough. Yet, Byron Leftwhich ran that offense with ease too.
Warner has too many weapons in every offense he has ran to ever be considered the best.
Joe Flacco was restricted in his offense, thanks to the ingenious mind of Cam "1-15" Cleeland... he doesnt trust rookie QBs and would hae preferred to keep him on the sideline.... if Kyle Boller had a Cam Cleeland to limit his ability to mess up, people in Baltimore wouldnt vomit at the sound of his name too.
SO.... who do I think?
THE BEST QB IN THE NFL RIGHT NOW IS MATT RYAN.... winning one of the toughest divisions in the NFL his ROOKIE year... All I can say is, wait and see....