A valid criticism is that Google's own products will presumably not be penalized in search results for these low scores. I'm happy to be wrong on that assumpti

A valid criticism is that Google's own products will presumably not be penalized in search results for these low scores. I'm happy to be wrong on that assumption, of course, but I think it's a reasonable one to make, and it severely dampens my willingness to agree that Google deserves praise for setting a high bar that it must itself struggle to reach in order to provide real value to users.