An interesting article was posted the other day. It rated the best QB play of all time in the playoffs. It took things into account how the QB played, how good the defense they played against was, and if the outcome of the game was not their fault. Such as the offense may have scored 30 something, but defense gave up 40. There were 225 QB's who qualified and so they ranked them based off the data they gathered 1 through 225.
They looked at all the playoff games since the merger. The top 10 playoff QB's of all time based off of this are:
1. Joe Montana
2. Kurt Warner
3. Tom Brady
4. Ken Stabler
5. Drew Brees
6. Terry Bradshaw
7. Peyton Manning
8. Aaron Rodgers
9. John Elway
10. Brett Favre.
The Bottom 5 on the list are:
221. Jay Fielder
222. Kordell Stewart
223. Stan Humphries
224. Drew Bledsoe
225. Andy Dalton
A few other things from the article:
Clearly, the narratives around Montana (who is a mile ahead of everyone) and Brady are correct. Interestingly, though, quarterbacks like Kurt Warner, Ken Stabler and Terry Bradshaw, who at times have been painted as quarterbacks who got into the Hall of Fame because of Super Bowl rings and the success of their teammates, are among the top-six most valuable postseason quarterbacks in NFL history.
Manning and Rodgers, quarterbacks who "didn't win enough considering their talent", are ranked seventh and eighth all-time, well ahead of the likes of Dan Marino (41st) who battled the same narrative a decade or two before them.
As you can see, Andy Dalton, the current starting quarterback of the Bengals, is considered to be the most-costly passer in the last 49 years of NFL football when you take into account of his opponent's averages. Drew Bledsoe, New England's starting quarterback before Brady, is the second-most-costly passer in postseason history.
The only Hall of Fame quarterback in the negatives is Sonny Jurgensen, though the stats only measure the later portion of his career, which started in 1957.
Quantifying the Best Playoff Quarterbacks Since the Merger - Optimum Scouting