Players have been disappointing their teammates and fans since long before you or I were born.  The difference in todays game is the amount of money some of these disappointments are making.  Players like Mario Williams and Michael Vick are making tens of millions of dollars and trapping their team under the weight of their contract.  So, if these players don't perform they could really doom an entire team.

Then there are players who don't necessarily make huge money, but based on their name people expect results.  Randy Moss and Tim Tebow are two that come to mind.

Quarterbacks seem to dominate this list, but when you are the biggest name on the team and typically the highest paid you are almost certain to get the most scrutiny.  Fair or not.

Many people have been left out.  This is my list.  Let the debating begin.