Should I read a new script before I review the production?

guardian.co.uk: "As well as discussing the various issues facing theatre criticism in our respective countries, comparing the various traditions of reviewing and talking about the problems that we encounter, we are also assessing a large selection of the new plays being shown here. And this is where the differences between critical cultures really start to show. As preparation for our reviews, our coordinator sent us all the respective scripts of the plays that we would be seeing."