In the past 30+ years, the Rams were 5 out of 6 playoffs with Martz running the offense and 0-25+ without Martz running the offense.
Not bad means outstanding really.
The key to Martz is that he develops offensive players and makes them better by being fundamentally sound with a strong knowledge of the game.
Plus, they are prepared for any situation that comes up on the field. Players play better for Martz than they do for other coaches.
Plus, he gets them excited about playing football. Confident with a "can do" attitude.