Which NFL team is statistically the worst in history among existing franchises?

Statistically, it is the newcomers, the Houston Texansfrom 2002 to 2008 (.388), followed closely by the Tampa Bay Buccaneers (.393), and historically by the Arizona Cardinals, Atlanta Falcons, and New Orleans Saints. (Bucs, Cards, Falcons, and Saints did each reach the Super Bowl once, with the Bucs and Saints each winning their only appearance).