I personally think that Facebook suffers form the same problems, especially contentedness, with the additional problem in the fact that their founder and public face isn't all that likeable.
In short, solely because of Google+, Facebook is the new Myspace in all the wrong ways.
And of course, it would be naive to discount the advantage Google has through the presence of one person and one person alone; Andy Hertzfeld. He's a big hitter... a really big hitter. To me, it feels like Yoda just turned up to show the young upstarts what it really means to be a Jedi.