I think it's great! I enjoyed the interface, the theme is incredibly beautiful and the whole system just... you can just tell Google went all out with privacy, the whole Circles idea is just the best way to keep your boss from finding out your personal things(parties, family matters, friend meetings, etc.). While I did fall in love with it there are some things I wished they fixed. Chat. That is the biggest flaw in my opinion, there is no chatting system, I read Phil's Google+ app walkthrough and it made sense, they will eventually integrate Huddle with Google Talk and implement it in the web interface. I also agree the whole idea that the things most newly commented on or +1'd are on the top, but really it's annoying. Facebook has the right idea with the News Feed, and I hope Google follows with the same idea.
Other then that, I find Google+ to be amazing, if it had a web chat system then I could really enjoy it a lot more, as a lot of people I know don't really use G talk. I haven't tried Hangouts because I just joined literally 3 hours ago, but it detected the web cam on my CR-48, so that is promising.
If you want to add me to your Circle or vice versa, just hit me up, I have my G+ profile linked to my AC account(as you should all do, thanks forums).