Although I find Google+ interesting, it doesn't really seem all that useful to me. The webcam chat seems pretty neat, but currently I don't have a use for it.
I really DON'T like how Google+ changes my navigation bar. in fact, because of this one issue I wish I didn't even sign up for it. It took shopping link away! Now I have to click on "More" to get to shopping... Can't I customize this menu? It may not seem like a big deal, but I do a lot of shopping for other people besides myself, so I use the shopping link A "LOT."
I'm disappointed Google- you track everything I do, yet the most important navigational feature for your tools, the Menu bar, you make something less convenient about it.
Now, back to Google +. The circles are pretty cool, but they really wont even be useful until a lot of people have joined Google +. It seems that's what a lot of people including Google are banking on for Google's success with Google +. Well, if that's the case, it will fail. That's something Facebook can easily mimic.
The bottom line is Google + needs something to keep the few users it has there doing something useful until more people join. It needs an added functionality that's not so reliant on the social aspect of things. There's something out there for Google to make Google Plus the convenient stop for something besides social interaction.