Not really, no. Most people post a couple of times and get few reactions beyond one-liners, if that. Over time, fewer and fewer people who aren't Google employees (1) bother posting anymore. Picture posts get by far the most +1s and shares. Completely incomparable to the text-based discussion networks.

(1) As well as anyone promoting a business, I should add. I've seen a couple of writers and lots of professional photographers using G+ for self-promotion. That seems to work quite well for them, especially the photographers given how image-heavy G+ is.