Yes, the Saints lost to the Seahawks. Quite a few Saints starters were out for the game and Hasselbatch had an amazing game. The Saints were far from a dominant team in '10 and Atlanta wasn't any better throughout the year. Both teams had to fight for a bunch of tough wins. Saints fans, remember the Dallas game? Falcons fans, remember the 9ers game. Both were sure losses that were handed to our respective teams.
That said, the Saints are the winningest team in the NFC over the last 5 years. They have a Super Bowl ring and have been to 2 NFC championship games. I think that kinda settles the argument with any honest Falcons fan.