Marino never took a lot of sacks, including the season his o-line consisted of all backups. Peyton Manning and Tom Brady are the same way. Its almost as if the QB can somehow impact how many sacks he takes.
Shula always got criticized that he went for OL that could only pass block leaving Miami with no running game. The Dolphins always allowed the fewest sacks but couldn't produce a 1,000 yard rusher for years. Then Marino went down before the half in a game against the Browns and was replaced by Brock Hoard I think. The Browns sacked him 6 times in the 2nd half, almost half a year's worth of sacks in one half. It turned out that Miami's OL couldn't run block OR pass block. The low sack totals were due to the awareness of the QB, his ability to get rid of the ball in a flash and although he wasn't mobile he had the uncanny ability to make the 1st free rusher run right past him while keeping his eyes downfield.