Pittsburgh Steelers- Limas Sweed
It may seem ludicrous to include a Super Bowl winner on this list but the Steelers won it despite Limas Sweed. He had an electrifying career with the Texas Longhorns. Only an injury prevented teams from taking him in the first round of the 2008 draft. But analysts confidently predicted that he was a steal and a future all-time great.

Fans remember his horrible drop in the AFC Championship game as he fell short of expectations. Eventually, he dropped down their roster and became the seventh-choice wideout. Every year we see a college star fail to deliver at the highest level. This is just the clear difference between the two levels (via The Sportster).