For all the talk of Marino, the fact is that his teams got to and lost in the playoffs, frequently because he played badly. Over-rated IMO. In his one Super Bowl he put up a 66.9 passer rating.
And anyway, we aren't really talking about individuals. We are talking about types. Almost every Super Bowl has been won by a pocket QB. NO running QBs have won the Super Bowl. One scrambling QB (Steve Young, who later in his career ran when forced, not as planned plays - which is my definition of the difference between a scrambling QB and a running QB) has won the Super Bowl.
Will RG3 break the mold? Maybe. But the odds are against him.