What do you have with diaspora? Nothing! Other than some kids notion of what an open social network might look like. No code, no prior reputation, you don't even know if they can make a tic-tac-toe. You know nothing.
So please don't compare Diaspora, something that doesn't exist in any form, to something that does (facebook) or something that people are working on (fusion).
It's certainly possible they'll build a solid product, but for something of this magnitude, and with the amount of audacity they have within their ranks to accomplish something this monumental (especially coming close on $200,00), they haven't particularly sold their case to the technical crowd that what they're going to build wont turn into vaporware.
More pointedly, they haven't sold their case that diaspora will even be worth checking out.