Maybe they were great in 2011, but not so much in 2012. Maybe there was much buzz about this player, or players, headed into the season.

Whether it's via injury, being an ill-fit, bad coaching, or some other obstacle, the players in the following slideshow have yet to reach their potential during this 2012 season.

Perhaps by year's end, some, if not many, of the athletes listed here will right their ship, get their act together, and play the way their fans, and many experts, had projected.

But until then, they're disappointments, and here's a list of the NFL's worst offenders.