Anyone remember the 90s? Outside of the awesome zubaz and Clinton's extra-marital stuff? Me neither. But what I do remember is that teams really, really sucked at drafting quarterbacks back then. Between 1990 and 1999 there were twenty quarterbacks taken in the first round. Of those twenty quarterbacks, four were Peyton Manning (greatest ever), Donovan McNabb (actually underrated, really good), Steve McNair (probably overrated, still pretty good), and Drew Bledsoe (he...did some things, right? I remember him doing a thing once. You might remember it, too. No, not that thing. The other thing). That's an OK group, although Peyton is the only truly great player to come out of the entire decade.
Of the other 16 quarterbacks, the best of the group is probably Kerry Collins. You never want Kerry Collins to be the best of anything, unless for some reason you are ranking "best 1990s quarterbacks who were also drunken racists," and even then we all know we're just waiting for someone to crack and tell Brett Favre's darkest secrets.