Thanks for the comments so far guys @Andrea @Natascha. Great to raise interest in Google+.
I think there is a still a sense of "who/what are you?" with G+, as Natascha says, which as we all know seems to be taking a longer time to establish itself with the masses.
However, what I could see it being (growing up) is one of the best community platforms out there - https://plus.google.com/communities. This is especially true when you look at visually rich community groups, like the photography ones, which are exploding rapidly.
As the blog title says, it's certainly one to watch :)