Crowdsourced machine learning isn't new, but because Hunch has enough weight behind it, it might eventually become much more useful than a lot of other 'silly crap' out there. A native iPhone client for Hunch would then be quite welcome.
I assume the app will ultimately recommend that it not be used for anything but novelty purposes.
Additionally, why is it more reasonable for a MIT scientist to make a decision for you than for you to make your own? The issue I have with it has nothing to do with who worked on this app, or for how long.
For example, I don't use Twitter right now. I don't have a need to write 140 character messages to the general public. But I have changed in that I now see that Twitter could improve some situations in my life. I could imagine using it to send text messages to all my friends to see if they wanted to grab lunch. I could also see myself getting it if a future boss or coworker used it extensively. So while I could not see much value in Twitter when I first heard of it, I see value in it now.
So I am just assuming that I either don't fully understand how I could use Hunch, or I don't really need it right now. That just means I am not going to be an early adopter of their service. I would not say that the service is total crap.
Even now I can see some situations where I could use expert systems to make decisions. I remember when my parents got a new car my dad took the cost of the car, the mpg for the car, and the amount that he drove, and used that to find out which car he expected to be the cheapest. I am sure he would be willing to input some numbers into a web page and use the site's recommendation instead of doing all the work himself, assuming he would be able to actually view the decision tree.