I have written quite a bit about the fundamental issues with Google+. One of the major issues is the existing app (they broke it on iPhone 3G with an update, it was broken for 3 weeks). Another is the massive UI flaws, both browser, mobile and app based.
It is clear that they have taken the Agile methodology of "Only do the work that is absolutely required" to a completely new meaning. (Forgive me if I misquoted someone there).