Well, the good thing about G+ is that it's flexible - it can be anything you want it to be (and the same is true for facebook, I don't know about other community sites/social networks). You could use it for games or to meet people (of the opposite sex?). You can get the latest news about your favourite actors or bands, or you could get the latest global news on politics, economics and so on. You could use it as a communication hub for a group of friends who are scattered around the world or people who live in the same city can organise their meet-ups. It's a way to reconnect with old classmates or college / work buddies. It can even help you find a job!
It's just like the computer itself. It could be a game machine, a media center, a research tool that can easily rival the best libraries in the world or it could be a marvellous instrument that can help you tremendously in your work.
Google+ (and other social networks), just like the computer, depends on the user.
So, if all you see is "duckface pictures", ask yourself - Is the problem with Google Plus or is it you?
No insult intended, I'm just type-thinking.