I'm definitely not thrilled at the idea of Facebook being the One True Social Network, but the idea of a Google social network makes me sad, and more than a little nervous. The fact that Google is trying to exploit their search dominance to funnel people into a Facebook competitor screams "anti-trust violation" to me, and the information-control consequences make me a little woozy -- I'd rather that Facebook dominate the space completely than give Google any more of my personal information. Google+ may not be evil, but it isn't exactly lily-pure, either.
I'm hoping that this is another classic case of Nerd Blindness (much like Rob Malda's famous proclamation that the original iPod was 'lame'): Google has an exceptionally good technical reputation, so techies are foaming at the mouth to get access to their newest plaything, while everyone else just sees this as an attempt by a gigantic company to destroy a good service that it sees as a threat.
Cheering for Google to win in the social network space seems to be to be a bit like hoping that IBM will take down Microsoft. When giants fight, I can't summon up any other feeling than fear that the rest of us are going to get squashed.