The name thing was a huge deal-breaker for a fair number of people, and the pathologically horrible way they handled it made it a lot worse. I know dozens of people who would have used G+ but walked away from it because at least one person they knew had bad experiences with it. I spent months with my G+ account in various kinds of limbo because the "appeals" process for name decisions was completely dysfunctional. I eventually ran into someone on slashdot who knew a person who knew a person who could unstick my account and get my name approved, but by that time everyone had lost interest.
And one of my friends used to have a Picassa account, and then somehow it got marked as a G+ profile thing (even though she never intentionally activated G+), and then suspended because their algorithm thought the name was unrealistic, and then she lost access to the Picassa stuff. I don't know whether that actually got resolved.
Very badly run at every level. The most frustrating thing is, they had a guy writing about this who was apparently in some kind of leadership role, and he talked about how the appeals process should work and how the name stuff should work... And nothing he said actually had any influence on the behavior of the product. The actual appeals process consisted of a thing that did not include any mechanism at all for stating your case or explaining why you felt a given name was the right name to use for you, which was then ignored by a machine or possibly a person, who knows. That's it. No mechanism for response or interaction.
Google's hatred of actually dealing with things personally interacted very badly with a policy which was inherently personal.