There's a few issues I have with Atlanta's team. They're a great team, don't get me wrong, but I don't think they can keep up with some other teams.
Their frontcourt is my greatest concern. Boozer is a sorry defender, and while Nene is solid, that doesn't mean much if he's not on the court. Nene has had some big injury issues the last three seasons, and while that typically wouldn't be enough for me to seriously consider him an injury risk, let's keep in mind Nene's injury history dates back all the way to his earlier seasons. Even if we assume Nene does stay healthy, his minutes will need to be strictly monitored; he hasn't played north of 30 minutes in three seasons now, and he's never topped 33.6. Atlanta's playing him 28 each night, but backing him up is a 6'7 center who could never earn Pop's trust, and a rookie who has spent his entire summer rehabbing from two ankle injuries.
This points to another issue I have about the team: depth. As it stands, Gerald Henderson seems to be the primary option off the bench, but I'm not a big fan of his at all. The only thing he has shown to do during his career is putting up a ton of empty points, and doing it quite inconsistently. Obviously, the consequences of his play are diminished coming off the bench, but that's the theme of Atlanta's bench to me. Outside of Lin, there is nobody I would trust to have on a playoff team (with all due respect to John Henson, who I love but still think needs some time to develop).
Just to get by in the regular season, this team needs to be relying on Wade and Pierce (and even Boozer) much more than 30 minutes per game. It has solid perimeter defense but the interior is incredibly dependent on the durability of Nene, and there isn't much insurance behind him with young and/or unproven players.