Steve, that's an interesting piece not just for what it purports to cover given the provocative headline but also because it implies you have been active on its platform. I checked out your G+ profile you have just an "About" me page enabled there, no posts, no followers, zero engagement and no way for anyone to engage with you there. Playing devil's advocate here, on this one aspect, I wonder just how deep your experience of the platform goes, particularly when you go on to question the validity of the claims regarding activity on the platform based, I assume, on personal experience rather than stats (unless you have an alternative source, in which case I would love to take a look).
Back in 2011, Eric Schmidt at the Le Web conference in London, specifically stated that G+ is an "identity service" for the web. The fact that you become a member automatically when you use one of Google's services is key because G+ is central to the creation of an Entity for the individual, in the semantic web (though obviously whether you then take it up and use it is your choice, entirely). This is crucial to being found through search, having authority in social media networks and generating a sense of trust in one's digital profile. Clearly plusses without even getting into the advantage of fast indexing and sometimes automatics hashtagging of posts and links - another key element of semantic search.
These are benefits which are valuable in their own right before we even get into the kind of information flow and engagement that becomes possible through the platform itself.