Johnny Manziel
The Cleveland Browns have had some terrible luck drafting quarterbacks over the years. However, the warning signs were already flashing before they drafted Manziel in 2014. The former Aggies’ prospect had an outstanding college career but he loved partying and drugs. Meanwhile, some coaches found his arrogance to be more than they could handle.

Despite this, the Browns made him a first-round pick and invested their future in him. Unfortunately, he joined the ranks of Heisman Trophy winners who flopped after they turned pro. It hurt the fans because they hoped that they’d turn a corner with Manziel under center. Instead, he was out of the NFL after just two seasons (via Sportskeeda).