I think having played in Minnesota, in Seattle, and that home Philly game, really helped this team. Those were all billed as playoff type games. I realize they were not the playoffs, but they all had the big game feel...well except in Seattle where it only was fleeting and turned into a laugher after they started throttling them.
Having said that I could see the game one two ways. Either they come out smoking like in Seattle/New York, or it will be a tough game and I think where it could get tough is if Atlanta can keep Ryan clean by running the ball and then him being able to run play-action and force the secondary to cover Jones, Sanu, and Gabriel.
In fact both teams will probably being the same thing, get the run game going and then a lot of play-action. So this game may fall more on the Rams front seven than anywhere else. Keep the run game in check and harass the hell out of Ryan...do that and its s a 20 point win.... and no dumb penalties.