He's doing the best he can ...

[nili]

I suspect that perfection is no less an anthropomorphic concept than is imperfection.

Yes, absolutely!  I don't really think of God as being either imperfect or perfect, as defined through human subjectivity.
 
Thanks for that link to the  article on Tikkun Olam.

Edited for additional:
 
In all fairness to your rabbi, perhaps he might have elaborated more on his answer ("God isn't perfect") if time permitted?  I wasn't there at your service, so I wouldn't know.  I don't think that question that the congregant asked your rabbi was the sort of question that can be easily answered by saying that God is either "this" or "that."

She did, in fact, elaborate some, but the question was a tangential one coming at the end of her dvar Torah discussion and the elaboration dealt more with issues of Process Theology and Kabbalah than with the history and evolution of Judaism..