There is no question that Juan Pablo Montoya's NASCAR career has been a disappointment. With the announcement last week that Montoya would be leaving the Earnhardt Ganassi Racing team at season's end, it looks like his time in Sprint Cup may have come to an end.
Montoya's transition to stock cars has not been as successful as his previous ventures in Formula One and American open-wheel racing, but he has earned two Sprint Cup victories and finished eighth in the 2009 Sprint Cup championship.
As disappointing as Montoya has been, there are many others who have fared worse, falling off the map after a few disappointing seasons.
This list takes a look at those drivers—the ones who never quite lived up to expectations...the ones who looked destined for superstardom but were relegated to also-rans.