Al Horford clearly wasn't healthy, which affected them a great deal as well.
I think they should try to move Joe Johnson. Given his contract it won't be easy, but that seems to be where they need to upgrade. I might even consider Johnson for Amare straight up if I'm the Hawks. I know Amare is a bit duplicative, but a front-line of Horford, Amare, Smith would be match-up hell for most teams and is a nice mix of offense and defense.