Jim Fassel never had two straight winning seasons on the Giants and his teams were very inconsistent. When Mariucci was on San Fran, his teams were much more consistent. They only did bad when Steve Young's career ended, and then they got good again with Garcia. Fassel and Mariucci are both offensive coaches, but Mariucci's offenses were always better, which is what the Redskins need.
Jim Fassel Record, Statistics, and Category Ranks - Pro-Football-Reference.com
Steve Mariucci Record, Statistics, and Category Ranks - Pro-Football-Reference.com