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Most football fans would probably tell you that the best team that failed to win a Super Bowl would be the 2007 New England Patriots, who entered the big game that season with an 18-0 record but got spanked by the New York Giants. But those same Patriots had won a Super Bowl only three years before with the same coach, same system, same quarterback and essentially the same cast — nine of the 22 starters in that Super Bowl victory started three years later in the loss to the Giants. If you want to look at true hard-luck teams, here are the five greatest teams that did not win a Super Bowl despite a year or even several years in which they otherwise dominated.