That's not good for all the traditional reasons people don't like spam, of course. Then there's a more specific way in which this could pose a problem for Google.
Given that Google Buzz was already struggling on the PR front (all sorts of privacy issues cropped up since Google sort of sprung the feature on Gmail users without their permission), spammers could do its reputation serious harm. Think of it this way: a cool new technology with some bugs might be found acceptable . . . a new way for spammers to reach people doesn't stand much of a chance.
Google's very much in damage control mode at the moment, so we'll give this a while to see how things shake out.
Meanwhile if you're still paranoid about the whole Buzzy situation, you can still choose to Buzz Off (disable Google Buzz). Just follow the steps listed here.