They did a decent job throughout the season they were in the middle of the pack for sacks allowed, give credit to the Saints who have an agressive defense. By the way, Favre was not sacked once throughout the game, it's just that they took shots at him every time they had the chance. Whether it was after Favre got rid of the ball or not.
Also for those who think that the Vikings played better than the home time, you may be right but when you turnover as often as they did, you're bound to lose the game. And on this point it could have been worse on a few occasions the Saints failed to recover a fumble because their players instead of diving on the ball tried to pick it up.