Real names AND the instant account lock with no hope of reversal if your name failed the opaque real name check. I lost access to a gmail account and everything associated with it because g+ didn't like my name. Account totally locked. Gone. Forever.
For me, it's gone further: reading about other people being locked out of their gmail account with no recourse, because of that real names policy, is the reason I've never logged into Youtube (since, as far as I understood, to log into Youtube you had to have a Google+ account). I still watch videos, but never while logged into gmail (and as a consequence, I've never commented on any Youtube video, or posted any videos I might have recorded).
