I'll toss in another guy with stats seemingly way too gaudy to be in the discussion, but those of you who remember the college hype and that draft cycle will understand.
Despite 46233 passing yds and 275 TDs, Vinny Testaverde gets my vote.
In my lifetime, only three QB's have generated this amount of pre-draft buzz: Elway, Luck, and Vinny. Given his size, arm strength, and all-around prototype measurables, I'm not sure there's ever been a draft he wouldn't have gone #1.
21 seasons of relentless mediocrity later, he hung them up. He didn't shine bright and then burn out, he didn't completely fail like so many poorly scouted Houston and BYU QBs, he just hung around as a consistently blah reminder of failed promise for two decades.