I just saw on Android Police about needing a + account to post reviews on Play.
Google is getting annoying with +. At one time on the computer, I couldn't log out of Play as a big popup pestering me about joining was in the way. I am not interested in social sites, I really don't care what the rest of the people are posting, and I have better things to do. I have a FB account - only because I wanted some info from Truphone for Nokia, and that was where their customer service was. I prefer newsgroups and fora with moderators for information. I've still got FB for customer service, but everything is marked "only me" I have friended no one. Twitter only follows the Mars Rovers. I don't post.
I don't believe in putting all eggs in one basket. I no longer use Picasa, I cleaned that and Blogger out, but I can't delete the separate accounts, so they just sit there. Google will annoy me every now and then as to why I am not posting or using Google Voice. It's none of Google's business. If it gets to the point where I have to post, there's always "lorum ipsum dolor est." Google had problems with Buzz and I don't see any difference. Besides which, I have different nicknames all over and I simply don't want them easily joined. So I'd never sign into a site with another account.
My phone is rooted and I've gotten rid of all social apps totally. I will keep Gmail account, but I am slowly switching to another service. Once everyone is switched to use the new service, Gmail can just sit there for spammers. Google needs to realize that some of us just don't care, and to stop trying to force us to be something we are not.
I have a smartphone since dumbphones won't do the apps I do want. Sky Safari, Mobile Observatory, iBird Pro, Audubon.