Then they would had released the thing finished, not in an early beta. Especially so if they still are thinking of adding major features to get users to move from Facebook.
I've used google+ and it doesn't feel like a beta at all. Everything just worked as expected, the UI is great. And its the only out of the box working group video chat for Linux I know of. Plus some extra gimmicks like watching YouTube "together." It is correct that there isn't much you can do on google+ but does it need more "major features"? I've got no idea what they plan to do but what features could it need? Maybe some gardening game? Think of twitter, featurewise its near to nothing and still people spend hours on this site.
Google Talk was supposed to be replace existing IM networks.. That didn't really work out. The software was extremely limited. I don't know how it is now, but why should I or anyone else care.
To me - and luckily some of my friends - Google Talk is the best IM for *mobiles* out there. And so at least I do care.