Atlanta has a lot of wings that theoretically could defend Tatum and Brown. They also have bigs that can defend the rim. In theory, they are a tough matchup.
But the cohesion of their defense has been largely lacking, especially when you get them rotating and switching. The Cs are also adept at getting the matchups they want, which means they will be hunting Young and Bogdon all game.
If you don't respect a team, they will beat you. Snyder is a great coach and has demonstrated the ability to make adjustments with flawed rosters. Their offensive flow has been looking better. They have two very good big defenders/rebounders, and a bunch of switchy wings/guards that can attack.