Hard to say, I think the reason we were rejected is that we flat out aren't ready and the application made it pretty obvious.

I greatly appreciate Y-Combinator taking the time to review our app, because if I'd accepted "we're not ready" as a reason to not apply at all, then there's a good chance I'd have abandoned the idea of starting a business altogether.

You haven't gotten too many rejection letters then:

http://en.wikipedia.org/wiki/Rejection_Letter

This falls in the not-very-good category of "mass printed letter".