Your recollection is correct. Fiedler (and often the entire offense) was mostly a liability. And a QB like Marino, paired up with the Dolphins' defense c. 2000-2003, would have done some damage. However, the defense folded over and over again in big spots-- like the last two games of 2002 resulting in no playoffs.I hear this a lot and I find this inaccurate. Our defense couldn't defend against tight ends, or offenses like the Rams. There were some games where we got blew out badly. Was it because of press coverage? Bad linebacker core? I remember our secondary giving up big plays at times from the receiving end.
Of course, there were also the games where the entire team failed to show up-- like the 2000 divisional playoff game against the Raiders.