I don't think a pre-beta product needs any defense further than the fact that it is pre-beta. Besides most of the 'reviews' were positive about the OS and critical about the hardware which is merely the conduit for the OS at this point.
I don't know how you can call something "pre-beta" if you're giving it a release outside the organization. It's not as if Google didn't know people would be commenting on it. What does that term mean?