For formal reviews, please suggest some good guidelines for conducting quality reviews.
Most reviewers are would be happy to have some direction for reviewing resources. This will also lend credibility to the reviews.
It may turn out that the review guidelines and the reviewers develop a "following" - other educators come to trust the reviews and actively look for other resources reviewed to those criteria, like movie reviews. Reviewer X loved it so I will probably like it as well. Reviewer Y includes grade level estimates and topics that are very close to my needs.