That critic is David Rooney. It's obvious that Rudin forwarded his email chain to Riedel. He wants this in the press. And now if Rooney has anything negative to say, it can have less validity because it could be seen as payback. (That is, seen as payback by those who work in the industry and those who read these message boards.)
"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