I think Google Buzz will just join the heap of lots of other failed Google services.
It's designed to allow users to share links, photos, videos, and status updates with their friends, as well as talk about and shared content. It's very similar to the News Feed in Facebook in that regard and it's also similar to FriendFeed.
And that's Google Buzz's problem right there. It's a clone of to too many services that have already been released. Google Buzz looks like a "me-too" product. I don't think Google Buzz will get much press.
Also - add to this that the fact remains - if in order for it to even be 'usable' requires "integration" with other social networks... its just more evidence that it is trying to piggyback.