If I were an actor, I would say it would be unfair for someone to judge my performance of a role when one hasn't seen said performance.
To me, if you haven't seen the show, your opinion has zero value and absolutely zero validity.
Judge press performances on their own, DON'T have that opinion broaden out to be a general one of the entire show.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle