It should be possible to extract circles from one's email and messaging behavior, to find friends and cliques. It should be automated as best as possible.
Even simply the most contacted people in the last week - and sharing to those people the most, even though you might have a friend you haven't seen for a long time, and they might be a great friend, that doesn't automatically mean you want to share with them. To assume that people want to share more with better and older friends and less with newer friends is wrong.
Users should get a menu of content automatically provided based on prior contact and clique analysis, and pick the items and people they find interesting to ensure more permanent viewing, which in time can fade over time if that content isn't liked. Even tracking what is clicked can automate this without having to manually like or +1 something - it's like listening to a person speak.
The last thing I want to do is setup a G+ account and start customizing friends lists, circles, clicking like and dislike buttons - it should be automated, and Google should delve into my GTalk and Email to see people I've been in contact. Whose emails am I replying? What people am I having conversations? I don't quite know who all my online friends are - G+ should work that out for me and cement those relationships without my input. Online friend dynamics are too liquid to be manual.
The problem isn't circles, it's the way they are created, edited and devised.