1. Andrew Luck
We’re not saying that Luck wasn’t a great player because he was elite. However, he also retired at the age of 29 and was never able to show his full potential. Many quarterbacks blossom in their thirties because their brain catches up with their arm. Unfortunately, Luck suffered so many injuries that he was unable to take the step toward the Hall of Fame level of greatness. And that was a real tragedy.
He was still a four-time Pro Bowler and led the league in passing touchdowns in 2014. However, Luck absorbed a ludicrous number of hits during his seven seasons in the NFL. The Colts had a genuine franchise quarterback on their hands. But they threw him away because they didn’t protect him. The Ringer reported that he was hit or sacked 352 times across his career.