Yesterday I finally got the button. I was somewhat busy at first, so I just glanced at the games available. I was somewhat disappointed to see time-sink games, but that's obviously very subjective. Of course they had Angry Birds!

Later, when I could spend a bit more time I went back and was presented with a screen explaining that games would need access to my information and tried to paint as rosy a view of that as possible[1]. I clicked through to play Angry Birds and was presented with specifics of what that particular game wanted to access: too much. Why?! I can play Angry Birds on my phone or tablet and not give anyone my info. I declined.

1. "Games on G+ are social" or some such nonsense. Of course games are social! Giving up my private info does not make them more social. The cited examples of showing you which friends have been playing the game you're looking at could (and should) be done by G+ itself, not the game app.