So far I'd say it has potential, but still isn't worth using just yet.
It has the ability to pull in posts from other rss type sites which is rather cool.
It is trying to integrate into gmail which has potential, however the integration is pretty poor still.
It has some pretty big security concerns still and is difficult to find exactly what you want when looking through it.
My biggest complaint is the email integration, it floods the gmail inbox with emails that are only half integrated into the sharing tool, they allow comments and moderation to be performed from them, however archiving and deletion have no effect on the sharing tool post itself. It's like a separate copy of the post was sent to gmail that has shortcuts in it to perform some of the convenience actions. This is a problem for me because the big thing I like about google is centralization, having two copies of a post sent to me seems to make management more difficult and just creates clutter.
Edit: this post is getting spammed a lot so I am trying to reword it to cut down on spam.