Aaron does deserve more than to be interacting with Sophie, and occasionally Allison (which usually ends in her misreading the entire situation, and turning what he says into an attack at her regarding her "history").
At the very least, I'd like to see him interact with family. It's like, he goes on without hearing ANYTHING about what his family is going through (Lily almost dying, Nuke being beat up, etc.).
Speaking of not interacting with immediate family, I didn't get to see any interaction with Katie and Craig before he left. The only sibling interaction I got to see with Craig is with Margo. True, it may not be plot related, but I find it interesting to see how people interact with their family, especially if it's Craig, since he seems to be a big softy for at least one of his sisters.