I think Brady unfairly gets docked for a few things:
1. Two SB losses...in those two games he played decent-to-good, despite a porous offensive line. In both of them it took remarkable, incredible plays for the opponent to win. In one he led a 4th quarter drive for a go-ahead TD and the defense couldn't hold. In the other the win would have been sealed had someone caught a pass. Additionally, Brady has 2 playoff one-and-done's, Montana has 4. Montana was HORRID in three of those losses...are we seriously docking Brady for GETTING TO THE SB and losing (despite giving his team a chance to win), vs flaming out before getting there?
2. Brady hasn't been 'magic' in the playoffs. He's been steady-Eddie, his lows aren't that low but he also hasn't blown teams out the way Montana did in many of his playoff games. Again though, is the goal to obliterate an opponent or get by them? Brady's done enough to win, consistently, more than anyone in football history. 12 playoff runs in his 13 healthy seasons, and just 2 one-and-dones, just two real stinkers (Denver in 2005, Baltimore in 2009). Every...other...year he's done enough for the team to win, and in most cases they have.
What people fail to realize--well, the people who are still propping up Montana and certainly those defending Manning--is that Brady isn't playing for stats, his numbers mean nothing if they don't win. He has consistently given his team a chance to win, and frequently led them on late drives for the winning score. Manning has been HORRID many, many years leading to playoff losses. Montana less frequently but he did it as well, and with the GOAT wide receiver as a buffer against those horrid games.
I love Montana, he was incredible. Brady's been better, and he's not done yet.