1) For youtube, having the ratings available is better to keep because it helps promote OCR on their system. I know that lots of youtubers hesitate watching videos of less than X stars so, even though most if not all OCR videos all have five, disabling them would revert to all zeros and could lead to less viewership.
2) Despite representing the site's mission as best as possible, people will always have opinions on mixes, which is why people are allowed and encouraged to leave feedback on them whenever possible. When a judge is doing judge duties, then yes, they should have the mission first and foremost in their minds. The forums system here also deliberately states that "best of" threads aren't allowed for all of mentioned reasons. However, if it's a personal blog, even OCR-hosted, since it is still far enough "personalized" I think that it would be fine to list the mixes one likes a lot. On the same token they should be free to list the ones they don't like, because it's not part of the forums and 100% that person's domain. I'm sure once the blogs come up there will be rules, and I may or may not be wrong about my assumption, but I don't think the blogs will be subject to censorship of personal preference.
You would, prophetikmephistoman.