I probably would have been interested at some point had I started using it by my own initiative, but I got forced into Google+ by this project.

I didn't understand what it was (a bare bones Facebook clone? ), didn't have friends who used it and I can't remember if I saw no content or just only irrelevant content. I gave it maybe 15 minutes and never came back.

And I actually considered myself an interested user, at the time I used Facebook but hated it and still saw Google as a force for good.