Google is addicted to social because it seems to be the only game in town that can bring in magnitude times more people than a typical product could (e.g. Basecamp)
Color was founded with this power-team of folks that had proven records so when the Hyposaurus came stumbling down the block and Google saw it coming with the potential to snatch up an amazing team with the potential to pull in millions of more users into the Google ecosystem and then direct them not just towards ads, but all their other offerings... it looked like it had every indicator that it would fly.
Unfortunately it looks like some air got let out of the tires and things slowed down considerably for them.
I don't know that I have all the faith in Color staying around, but Path I believe has staying power. They have a really cohesive/directed vision and purpose that they are executing really well.
They may not launch with a billion new accounts a minute, but I think there is so much solid product/story there that once they pass that event horizon, they'll have people pouring into them.
Sort of like a Tumblr or Posterous growth curve -- really focused, really solid products so once people start taking notice, everyone likes what they see.
Just my 2 cents and I used to eat a lot of paint as a kid... so take this all with lots of salt.
1) There are reports that Google offered some of its product managers tens of millions of dollars to keep them from joining Twitter. If that's how they're valuing talent, then $200M is in the ballpark for Color's "superstar team" combined with some very interesting IP,
2) Smart investors described Color's technology as breakthrough and potentially "the next Google". Even accounting for some hyperbole, suppose that it really is groundbreaking for reasons that us mere mortals can't fully grok. In that case, adding it to Google's arsenal and combining it with all their other assets (and proven engineering and operations strength) could be a multi-billion-dollar win and a big addition to Google+. Or not, as the case may be; but making a risk/reward tradeoff, it could have looked attractive.
Not comparing Color to them talent-wise, just saying, you made me smile :)
And then sometimes stupid is just stupid. This is Earth.
Think of all the companies google has made these offers to and the deal didn't happen. Strategy at this level is kind of like macroeconomics, it just doesn't map to what makes sense on face value.
The people running a company like Google don't necessarily have wisdom you don't - see Microsoft, Yahoo! or (especially after dismantling Google Labs) AOL.
There isn't necessarily rational thinking behind it.
It sounds like you're not too enthusiastic about it either ;)