Orkut, Buzz, Wave are all failed(unless you are Brazilian) attempts at social networking. You have to admire their tenacity in continuing to come back to the well.
There are already things I don't like about G+ and things I do like, but the things I do like I probably like because I am bit geeky when it comes to new things.
On Facebook I regularly have over 200 people available to chat but NEVER talk to anyone on Facebook chat, it's either Skype or Trillian, but I could see my non-tech relatives using Facebook chat or their Facebook e-mail account.
I like the idea of the "Hangout" even though it is limited to 10 concurrent users, I am thinking mastermind groups, small elite webinars, but it should be better than Skype, at least until Microsoft sort Skype out.
Unless you have the ability of carrying over what you post on Facebook into G+ I don't want to be writing the same crap twice.