That's also how I tend to use it. I think the main issue was that it was positioned as "hey, we built a better Facebook!"
This was somewhat accurate IMO since I prefer the layout, features (many of which Facebook added shortly after), and granular sharing (which Facebook most certainly lacks).
The main issue I ran across was that Facebook continued to dominate in the space because it was the first to gain a critical mass of users across a wide spectrum. MySpace was big with the younger crowd but typically you didn't find your mom, your boss, your barber alongside your friends and drinking buddies.
Facebook was the first big one where eventually all of your relatives (even the ones who typically didn't care about "techie" stuff) and acquaintances built a profile. So when G+ came out, most of my friends tried it out and quickly realized that they would still need to cross-post things to Facebook if they wanted to share with all of their contacts and not just those who like trying out new things.
Without a common API or protocol, there was no way to just pick the service you prefer and go on with your life. With email, I could switch from Hotmail to Yahoo to Gmail (or even roll my own server) in search of the right setup for my preferences. I could still email anyone who refused to give up their AOL account or who used their work email.
Facebook-style social networking requires everyone to be on the same platform in order for it to work. So instead of some people sticking with Facebook while a big chunk slowly migrated to G+ or other competitors over the space of a few years, you ended up with lots of people trying out G+ and getting annoyed that only a few friends bothered to read/reply.
So now it's mostly used as more of a subreddit-style thing where you can have topical groups rather than personal friends and acquaintances. I still do think it's a shame they couldn't "build a better Facebook" because it would be nice to have a few options for that type of thing. But unless some new player can convince absolutely everyone you know to migrate, it just isn't happening anytime soon.