First, Google has made moves to indicate that Google+ is not a finished product, or even a 1.0 release. Their recent overhaul shows that. Their lack of public APIs shows that. Secondly, Google has made it pretty clear that Google+ does not stand on its own. The "plus" is in the name after "Google". It's Google, plus. Google+ is just a frontend, an entry point. It's the Yahoo landing site for all of Google's services.…
Tell that to my new Google+ Cover Photo....
Even if all of your points are valid, you must admit they keep releasing numbers trying to show it's this super fast growing network, and yet you can see just by the number of sites that have a G+ button, that people are not even engaging in that level of activity. Pinterest on the other hand, which has actual user engagement is already starting to overtake Google on these little + buttons.