I think it's noisy and useless. The UI isn't innovative or fun (or pretty), comments can't be threaded, the follower/friend model is too difficult for end users

I think it's noisy and useless. The UI isn't innovative or fun (or pretty), comments can't be threaded, the follower/friend model is too difficult for end users, it's not importing tweets at all, it's got massive delays for importing other media, it's pure clutter. Moreover, most of us who want to use microblog platforms to communicate with friends already do, and we have established networks for those things. Google doesn't integrate those tools at all, neither by using FB Connect/Twitter OAuth to find Buzz-using friends nor by using those services' APIs to centralize posting, the way more successful clients have done. Google reinvented the wheel, badly.