Yeah: this aspect--where the circles were essentially backwards--made the feature essentially useless. I post stuff about Android, and I post stuff about iOS, and I post stuff about abstract programming languages. Great! So I make three circles, and then... wait, users don't add themselves to my circles, they just follow my entire account and then I have to add people to the right circles somehow? ?!?
Circles are a great solution for social circles on a social network. I think most people who post like you describe would just use a mailing list, or a blog with multiple RSS feeds.