Miami has a long history of drafting below the mean. Even the early 70's teams had a number of acquisitions from other teams and/or undrafted guys/waiver wire guys, etc (Langer, Little, Kuech, Buonoconti, Warfield etc), on top of a couple of elite draft picks in Griese and Csonka. Other than a few flurries, the franchise drafted poorly. The late 70's and into the early 80's led to a number of excellent picks where the team went to the Alabama well for the likes of Bob Baumhower. Don McNeal, Tony Nathan and the incomparable Dwight Stephenson, and had a number of other nice picks. Whoever helped with the draft in that period did well.
But really, later, the Shula regime really let Marino down by not putting enough solid talent around him. Yes, there were some good picks. There was the Webb/Sims double whammy. But, there was a flurry of Bosa, Kumerow, Graf, Brophy, Shipp, Sammie, Hampton, Scott Schwedes, Eddie Blake, TJ Turner, Oglesby, trading two high picks for Hugh Green, etc. I mean those are all high picks. What a comedy of errors. I think I accounted for 13 1st to 3rd round picks in Marino's early prime years. You have to try to be that bad.
Jimmy drafted fine for defense and blew it on offense although he wasn't here very long. He may have corrected the offense if he stayed. Since he left, the track record has been awful.
At some point, maybe the franchise will draft above the mean to break even.