Since you won’t, I will. Looking only at Favre’s late-game playoff stuff, looking for games decided in the fourth quarter by using Wikipedia:
1993 playoffs. GB 28, DET 24. Favre throws a 40-yard TD pass to Sterling Sharpe with 55 seconds left.
1995 playoffs. Favre throws a pick-six in the NFC Championship game to ice it for Dallas.
1997 playoffs. Favre drives the Packers down for a score after Tampa Bay pulled within 6. He ran the 2-point in himself to ice it.
1998 playoffs. I’ll let Wiki tell it. “Trailing 23-20 with 2 minutes remaining, Favre lofted a 15-yard touchdown pass to Freeman, completing an 89-yard drive that had seen the Packers run a risky 4th-and-1 play from deep in their own territory and Favre completing a 47-yard pass to seldom-used rookie receiver Corey Bradford. But San Francisco responded with an equally impressive drive, in which Jerry Rice visibly fumbled and instant replay was not in effect until the following year, allowing the drive to continue behind Young, who completed 7-of-9 passes in a 76-yard drive for the winning score,. Owens, who had dropped four passes and lost a fumble, caught the 25-yard winning touchdown pass with eight seconds left in the game (a.k.a. The Catch II).”
2001 playoffs. “In the fourth quarter, Hearst’s 22-yard reception and 10-yard run set up a 14-yard touchdown pass from Garcia to Tai Streets, who also caught a subsequent 2-point conversion pass to tie the game at 15. But Green Bay responded with a 49-yard drive and retook the lead with a 45-yard field goal from Longwell. Then on San Francisco’s ensuing possession, defensive back Mike McKenzie deflected a pass from Garcia into the arms of Tyrone Williams for an interception on the Packers 7-yard line. Favre took over from there, leading the Packers on an 8-play 93-yard drive for the game clinching touchdown, featuring two key third down completions to Driver. The first was 37-yard completion third down and 12. Later, Driver caught a 12-yard pass on the 49ers 9-yard line on third down and 6. On the next play, running back Ahman Green scored on a 9-yard touchdown run with 1:55 left in regulation.”
2003 NFL playoffs. “Seattle went three-and-out on their next drive, and Chatman returned Rouen’s punt 21 yards to the Seahawks 49-yard line. Favre once again led the Packers on another long scoring drive, moving the ball 49 yards in 12 plays and consuming 6:51 off the clock. Green finished the drive with another 1-yard touchdown run, and Longwell’s extra point gave the Packers a 27-20 lead with 2:39 left in regulation. But Hasslbeck responded by completing 3 of 5 passes for 59 yards, including a 34-yard pass to Engram, on the way to Alexander’s third 1-yard touchdown run to tie the game. Favre’s 27-yard completion to Walker on the Packers ensuing drive gave them a chance to win, but Longwell missed a 47-yard field goal attempt on the last play of the fourth quarter, and it went into overtime. After both teams went three-and-out on their first drives of the extra period, Seattle drove to their own 45-yard before Harris’ 52-yard interception return for a touchdown won the game.”
Mentioned because Favre put them in position for a FG to end the game, but it was missed. The deciding score was a pick-six of the other QB.
Same year, NFC Championship: “Philadelphia won the coin toss in overtime, but they were forced to punt after three plays and Chatman returned the ball 15 yards to the 42-yard line. However, defensive back Brian Dawkins intercepted Favre’s first pass of the ensuing drive and returned it 35 yards to the Packers 34-yard line. An 11-yard run by Staley and an 8-yard reception by Pinkston then set up a 31-yard field goal from Akers to win the game.”
Favre mistake.
2007 NFL playoffs: “Green Bay won the coin toss to start the extra period, but on the second play of overtime Favre’s pass, which would be his last as a Packer, was intercepted by Giants defensive back Corey Webster, who returned the ball 9 yards to the Green Bay 34-yard line. The Giants gained five yards on three plays and then sent Tynes out to try his fifth field goal of the game, and his longest attempt of the day (47 yards). Just as Matt Bahr had done seventeen years prior to the day, Tynes connected on the game-winning field goal, clinching a fourth NFC Championship for the Giants and their first since 2000.”
Favre mistake.
2009 NFL playoffs: NFC Championship game, the cross-body throw that the Saints picked off to set up Garrett Hartley’s game-winner. Favre mistake.
So in the playoffs, that’s… 3-4, with one set of heroics outdone by the other side, and one where he put them in position to win before overtime but the kicker missed, yet the Packers won in OT on a defensive play. So somewhere around 5-4 or 4-5, depending on your metrics.
This doesn’t include playoff games where one side was leading by a wide margin, and I think Favre had more of those for him than against him, but I didn’t count. I didn’t look at the regular season because those aren’t easy to find.
In short, what have we determined? Favre is a streaky gunslinger, as you said, but it’s not “Epic Fail in all counts.” It’s close to 50/50, which was my wild guess, so that works out well in making me feel important, at least. You could argue that Favre has been worse in the playoffs lately, but I’m not sure if that’s correct without looking closer at the games. He’s made some awful decisions with the ball late, having ended all of his seasons lately with turnovers, but I don’t want to place extra blame on him instead of his teammates – same as I don’t want extra credit heaped on him instead of his teammates.