Shula won 2 Super Bowls without Marino, the Bills were a small finesse team that got destroyed by bigger, better NFC teams.
Again, name one thing Tomlin does well.
Shula didn't win anything WITH Marino, a franchise QB. Levy couldn't win WITH Kelly, a franchise QB. Quit trying to move the marker (i.e. change the terms of your argument) it only makes you seem petulant.
Let's see, Tomlin is a great at delegating to his assistant coaches so that they have the power and responsibility to do their jobs. His Winning percentage so far is extremely high, so I'd say he's pretty good at winning (don't forget, he has 2 Super Bowl rings having EARNED one as the DB coach at Tampa Bay). He's hella good at recognizing WR talent. He's secure enough in his coaching ability that he has hired not one, not two, but three ex-head coaches on his staff. He's won 50% of the Super Bowls his teams have appeared in with him as a Head Coach (that's doing something pretty good). He's never had a losing season.
Enough already ... the man may not be to your liking we get that (how could we not with your constant whining), but he's done a better job than you give him credit for even if he hasn't been perfect.