Think about this...did you ever say to yourself, "oh shit, my team has to face CURTIS MARTIN this week!"? Of course not. He wasn't dynamic, he wasn't any sort of gamebreaker, he didn't take over games. He would run in a straight line for 3 or 4 yards,fall down, and repeat. He never got hurt, played a million years, and racked up some stats.
I doubt there was ever a time Martin was the best player on the field. He was a good player, but not a HOF player.