In the NFL, no team can reach great heights without at least competent play from the quarterback position. If you don't have a "franchise quarterback," you are looking for one; if you have one, you do everything in your power to keep him.
Sometimes, it can be difficult to determine if that special player is on your roster. When teams make this error in judgement, it can set a franchise back several years.
Here are some of the recent contracts given to unworthy quarterbacks.