Absolutely. The quality of content is far better than on FB or Twitter. When G+ was a year old or so, an image was circulated comparing the most discussed people on 3 social networks. On Facebook and Twitter is was Rihanna and Justin Bieber, on Google+ it was Einstein. I'm regularly having interesting political, philosophical and ethical discussions there. And most importantly to me personally: it's probably the best RPG community on the Web.
Looking only at the number of public posts is fairly meaningless; lots of people share only to specific circles in order to not spam their followers on one topic with posts on a different topic. Even more people don't post much themselves, but are very active in other people's conversations. It's a social network, after all, not just a blogging platform. But people love to use the lack of public posts to shame Google for some reason.
It's not that all is perfect, though. The quality of the content took a serious hit through the integration with YouTube (home of probably the lowest quality comments on the web). And through pushing birthdays and phone numbers of my G+ contacts to my calendar and phone, Google seems eager to punish people for having any Google+ contacts at all. Google should stop fucking about and just give us more tools to manage our stream so we can follow more people on topics that interest us, without having to see their posts on topics that don't interest us.