Ditka screwed him from the start because of all the draft picks he gave up. Ricky, suffering from social anxiety, then became the face of the franchise, the savior. He never had a chance.
I brought my dad to the Saints-Cowboys game as a Christmas gift Ricky's rookie year. (unrelated side note, it was Jake Delhomme's first career start) I remember on one play, two Dallas defenders were in the backfield so quickly, Delhomme barely got the handoff to Ricky before the play was blown up for a loss. Fans were booing and yelling "You suck Ricky!!"
A Super Bowl title and the most rushing yards ever might have been enough for the fans. Even then, I'm not so sure.