It's the players, not the coaches (see: Ryan in New Orleans), which is alarming because it's a lot easier to replace one coach than say ten mediocre players.
You clearly care about regular season rotisserie stats more than I do. To me, that's not the mark of a great QB. Marino, for all his failings, steered his team to many more post-season wins than Tony.
2007: Who cares if Tony threw five picks in Buffalo? He put us in a position to win the game!
2013: Who cares if Tony threw a pick that cost us the game? He threw five touchdowns!
The comparison is perfectly apt. They're all short, scrappy QBs who overcame their humble collegiate beginnings to have success in the NFL. But Romo is far behind both of them where it matters: the post-season.