Herm had no team with the Jets. Pennington is a pussy, he cant throw, and when he's healthy he has no arm strength. He had a solid back in Martin, but other than that he didnt really have many playmakers on the offensive side of the ball after Santana Moss left. Theyve got Coles back now, but he's been going downhill since he was traded after the 2002 season. They also didnt really have much defense to speak of. I believe they made the playoffs 3 times under Edwards, so I'd say given the team and situation he did a very solid job of coaching that team.
Edit: Outside of Martin and Coles/Moss, for the years Herm coached them, those were basically the only offensive threats.