I was in junior high when Marino had his first pro bowl season. I have seen several better passers. Marino had two pro bowl deep threat wide receivers in Clayton and Duper whom he would lob balls to. Marino was great at long bombs but his DECISION MAKING and ACCURACY were not as impressive. He is not a guy you want in the clutch, unless you want a risky, desperate attempt. (In today's game, he's more like Big Ben and Rivers than Brady or Rodgers.)
If Marino had won two Super Bowls, he'd still not be as talented or esteemed as Montana, but he would be argued to be a bit better than John Elway, though that would be debated.
Marino would need three or more Superbowl MVP performances (not just rings) to be even arguable as the GOAT.
To recap:
1. Marino lacked key traits of the greatest QBs ever;
2. It's not just about winning the cup, at least, in terms of Marino. He'd have to dominate.
Gretzky doesn't have those same conditions.
Interesting, he was before my time. But I can't fathom someone saying he's not as talented as Montana. I never thought of Montana as the most talented QB. I always thought of him as the perfect system QB.