Yup. This is a more pass happy league nowadays. Back when Marino was playing the NFC dominated super bowls because of good defenses and BIG STRONG offensive lines being able to run the ball.
Elway didn't win a super bowl until he got a 2000 yard rusher in Terrell Davis along with a much bigger and stronger defense in Denver. And Favre didn't win a super bowl until he had the #1 ranked defense on his team and a very good running attack on offense.
The running game was more important during the Marino years.. Of course now that the passing game is of prime importance (as all the rules benefit the passing game), the Dolphins are more of a running team these days.
Just goes to show the frustration of being a Dolphins fan.