I've made this comparison before, and I don't mean it unflatteringly, but every feature mentioned (and I agree with you) - was present in Friendfeed. Sorry. is
present in Friendfeed. So, while Google+ may succeed where Friendfeed failed, it probably won't be for features.
As it is now, it "feels" a little bit like a mix of Twitter 2007 and Wave. New shiney, mixed with a really geeky and engaging core. However, we all know where Wave ended up; and Twitter, though still valuable, clearly lost its 2007 appeal with breaking social discovery through the #fixReplies saga and viewing Trending Topics as a business model rather than making it more interesting (such as Friendfeed's "popular among your friends", "popular today", etc.) and searchable.
Just my 2¢. And lest I sound like a "hater," I wish for all these services to do well. To me, it makes sense to have a place to go to engage with your geek friends, a place to go to read the thoughts of people who'll never talk back, a place to go to share pictures of your dog or cat with friends who you see everyday... To me, they should be able to co-exist, but so far (so far) it seems like most people want one place to go, maybe two.
As a sidenote, I originally posted this comment on a Shared version of this post. Little did I know that it doesn't work the way Facebook does, with one "true" post that all see. Instead, it forks. I thought it was a little odd that a post by +Kevin Rose
would only have 2 other comments... but apparently, I'm still learning my way around Google+.