You're blending the two back to back playoff games we lost to them.
In the 2007 season, we lost to them in the final game in the Dome when we had a bye. That was the game in which Harrison returned after sitting out most of the season. He fumbled a ball in the red zone when we were trying to go up 14-0, IIRC. That was the game in which Billy Volek beat us in the second half. The Chargers were 11-5 that season. We also lost to them in the regular season that year at SD when Manning threw six picks and Vinny missed that chip shot at the end.
Then the next year we had to play them on the road. We were a 12-4 wildcard and they won the division with an 8-8 record. That was the OT game in which their punter beat us. God I hate the Chargers. How did we lose to those clowns in back to back seasons?
I agree with you about the Saints Super Bowl. Everything would feel different if we had won that. Instead of feeling that we should have accomplished a bit more, we'd be saying that we won 2 out of 4 Super Bowls. No one could really say anything about Manning's playoff record. But it is what it is. Brady would probably be the GOAT if he had won either of the Giants Super Bowls, especially if they had won the first one and completed the perfect season. But that's just football.
The Saints Super Bowl is especially haunting when you realize that Manning only played here for one more season after that, which was a bizarre season in which he had that slump (injury was probably starting to get to him) and we only went 10-6. Lost to the freaking Jets in that agonizing wild card game.
Here is a Manning stat that is tough to digest: After winning the Super Bowl in the 2006 season, Manning's teams went one and done in 4 of the next 5 seasons. Granted, his team made the Super Bowl in the year where he didn't go one and done, but that stat is still pretty haunting. (Obviously I didn't count 2011 in there since he didn't play)